37. High-Resolution Timer (HRTIM)

37.1 Introduction

The high-resolution timer can generate up to 10 digital signals with highly accurate timings. It is primarily intended to drive power conversion systems such as switch mode power supplies or lighting systems, but can be of general purpose usage, whenever a very fine timing resolution is expected.

Its modular architecture allows to generate either independent or coupled waveforms. The wave-shape is defined by self-contained timings (using counters and compare units) and a broad range of external events, such as analog or digital feedbacks and synchronization signals. This allows to produce a large variety of control signal (PWM, phase-shifted, constant Ton,...) and address most of conversion topologies.

For control and monitoring purposes, the timer has also timing measure capabilities and links to built-in ADC and DAC converters. Last, it features light-load management mode and is able to handle various fault schemes for safe shut-down purposes.

37.2 Main features

• • Multiple timing units
  • – Full-resolution available on all outputs, possibility to adjust duty-cycle, frequency and pulse width in triggered one-pulse mode
  • – 6 16-bit timing units (each one with an independent counter and 4 compare units)
  • – 10 outputs that can be controlled by any timing unit, up to 32 set/reset sources per channel
  • – Modular architecture to address either multiple independent converters with 1 or 2 switches or few large multi-switch topologies
• • Up to 10 external events, available for any timing unit
  • – Programmable polarity and edge sensitivity
  • – 5 events with a fast asynchronous mode
  • – 5 events with a programmable digital filter
  • – Spurious events filtering with blanking and windowing modes
• • Multiple links to built-in analog peripherals
  • – 4 triggers to ADC converters
  • – 3 triggers to DAC converters
  • – 3 comparators for analog signal conditioning
• • Versatile protection scheme
  • – 5 fault inputs can be combined and associated to any timing unit
  • – Programmable polarity, edge sensitivity, and programmable digital filter
  • – dedicated delayed protections for resonant converters
• • Multiple HRTIM instances can be synchronized with external synchronization inputs/outputs
• • Versatile output stage
  • – Full-resolution Deadtime insertion
  • – Programmable output polarity
  • – Chopper mode
• • Burst mode controller to handle light-load operation synchronously on multiple converters
• • 7 interrupt vectors, each one with up to 14 sources
• • 6 DMA requests with up to 14 sources, with a burst mode for multiple registers update

37.3 Functional description

37.3.1 General description

The HRTIM can be partitioned into several sub entities:

• • The master timer
• • The timing units (Timer A to Timer E)
• • The output stage
• • The burst mode controller
• • An external event and fault signal conditioning logic that is shared by all timers
• • The system interface

The master timer is based on a 16-bit up counter. It can set/reset any of the 10 outputs via 4 compare units and it provides synchronization signals to the 5 timer units. Its main purpose is to have the timer units controlled by a unique source. An interleaved buck converter is a typical application example where the master timer manages the phase-shifts between the multiple units.

The timer units are working either independently or coupled with the other timers including the master timer. Each timer contains the controls for two outputs. The outputs set/reset events are triggered either by the timing units compare registers or by events coming from the master timer, from the other timers or from external events.

The output stage has several duties

• • Addition of deadtime when the 2 outputs are configured in complementary PWM mode
• • Addition of a carrier frequency on top of the modulating signal
• • Management of fault events, by asynchronously asserting the outputs to a predefined safe level

The burst mode controller can take over the control of one or multiple timers in case of light-load operation. The burst length and period can be programmed, as well as the idle state of the outputs.

The external event and fault signal conditioning logic includes:

• • The input selection MUXes (for instance for selecting a digital input or an on-chip source for a given external event channel)
• • Polarity and edge-sensitivity programming
• • Digital filtering (for 5 channels out of 10)

The system interface allows the HRTIM to interact with the rest of the MCU:

• • Interrupt requests to the CPU
• • DMA controller for automatic accesses to/from the memories, including an HRTIM specific burst mode
• • Triggers for the ADC and DAC converters

The HRTIM registers are split into 7 groups:

• • Master timer registers
• • Timer A to Timer E registers
• • Common registers for features shared by all timer units

Note: As a writing convention, references to the 5 timing units in the text and in registers are generalized using the “x” letter, where x can be any value from A to E.

The block diagram of the timer is shown in Figure 281 .

Figure 281. High-resolution timer block diagram

37.3.2 HRTIM pins and internal signals

The table here below summarizes the HRTIM inputs and outputs, both on-chip and off-chip.

Table 303. HRTIM Input/output summary

Table 303. HRTIM Input/output summary (continued)

37.3.3 Clocks

The HRTIM must be supplied by the \( t_{HRTIM} \) system clock to offer a full resolution. All clocks present in the HRTIM are derived from this reference clock.

Definition of terms

\( f_{HRTIM} \) : main HRTIM clock (hrtim_ker_ck). All subsequent clocks are derived and synchronous with this source.

\( f_{DTG} \) : deadtime generator clock. For convenience, only the \( t_{DTG} \) period ( \( t_{DTG} = 1/f_{DTG} \) ) is used in this document.

\( f_{CHPFRQ} \) : chopper stage clock source.

\( f_{1STPW} \) : clock source defining the length of the initial pulse in chopper mode. For convenience, only the \( t_{1STPW} \) period ( \( t_{1STPW} = 1/f_{1STPW} \) ) is used in this document.

\( f_{BRST} \) : burst mode controller counter clock.

\( f_{SAMPLING} \) : clock needed to sample the fault or the external events inputs.

\( f_{FLTS} \) : clock derived from \( f_{HRTIM} \) which is used as a source for \( f_{SAMPLING} \) to filter fault events.

\( f_{EEVS} \) : clock derived from \( f_{HRTIM} \) which is used as a source for \( f_{SAMPLING} \) to filter external events.

\( f_{pclk} \) (hrtim_pclk): APB bus clock, needed for register read/write accesses

Timer clock and prescaler

Each timer in the HRTIM has its own individual clock prescaler, which allows you to adjust the timer resolution. (See Table 304 ).

Table 304. Timer resolution and min. PWM frequency for \( f_{HRTIM} = 400 \) MHz

1. CKPSC[2:0] values from 000 to 100 are reserved.

The Full-resolution is available for edge positioning, PWM period adjustment and externally triggered pulse duration.

Initialization

At start-up, it is mandatory to initialize first the prescaler bitfields before writing the compare and period registers. Once the timer is enabled (MCEN or TxCEN bit set in the HRTIM_MCR register), the prescaler cannot be modified.

When multiple timers are enabled, the prescalers are synchronized with the prescaler of the timer that was started first.

Warning: It is possible to have different prescaling ratios in the master and TIMA..E timers only if the counter and output behavior does not depend on other timers' information and signals. It is mandatory to configure identical prescaling ratios in these timers when one of the following events is propagated from one timing unit (or master timer) to another: output set/reset event, counter reset event, update event, external event filter or capture triggers. Prescaler factors not equal will yield to unpredictable results.

Deadtime generator clock

The deadtime prescaler is supplied by \( f_{HRTIM} / 8 / 2^{(DTPRSC[2:0])} \) , programmed with DTPRSC[2:0] bits in the HRTIM_DTxR register.

\( t_{DTG} \) ranges from 2.5 ns to 20 ns for \( f_{HRTIM} = 400 \) MHz.

Chopper stage clock

The chopper stage clock source \( f_{\text{CHPFRQ}} \) is derived from \( f_{\text{HRTIM}} \) with a division factor ranging from 16 to 256, so that \( 1.56 \text{ MHz} \leq f_{\text{CHPFRQ}} \leq 25 \text{ MHz} \) for \( f_{\text{HRTIM}} = 400 \text{ MHz} \) .

\( t_{1\text{STPW}} \) is the length of the initial pulse in chopper mode, programmed with the STRPW[3:0] bits in the HRTIM_CHPxR register, as follows:

It uses \( f_{\text{HRTIM}} / 16 \) as clock source (25 MHz for \( f_{\text{HRTIM}} = 400 \text{ MHz} \) ).

Burst Mode Prescaler

The burst mode controller counter clock \( f_{\text{BRST}} \) can be supplied by several sources, among which one is derived from \( f_{\text{HRTIM}} \) .

In this case, \( f_{\text{BRST}} \) ranges from \( f_{\text{HRTIM}} \) to \( f_{\text{HRTIM}} / 32768 \) (12.2 kHz for \( f_{\text{HRTIM}} = 400 \text{ MHz} \) ).

Fault input sampling clock

The fault input noise rejection filter has a time constant defined with \( f_{\text{SAMPLING}} \) which can be either \( f_{\text{HRTIM}} \) or \( f_{\text{FLTS}} \) .

\( f_{\text{FLTS}} \) is derived from \( f_{\text{HRTIM}} \) and ranges from 400 MHz to 50 MHz for \( f_{\text{HRTIM}} = 400 \text{ MHz} \) .

External Event input sampling clock

The fault input noise rejection filter has a time constant defined with \( f_{\text{SAMPLING}} \) which can be either \( f_{\text{HRTIM}} \) or \( f_{\text{EEVS}} \) .

\( f_{\text{EEVS}} \) is derived from \( f_{\text{HRTIM}} \) and ranges from 400 MHz to 50 MHz for \( f_{\text{HRTIM}} = 400 \text{ MHz} \) .

37.3.4 Timer A..E timing units

The HRTIM embeds 5 identical timing units made of a 16-bit up-counter with an auto-reload mechanism to define the counting period, 4 compare and 2 capture units, as per Figure 282. Each unit includes all control features for 2 outputs, so that it can operate as a standalone timer.

Figure 282. Timer A..E overview

The period and compare values must be within a lower and an upper limit related to the high-resolution implementation and listed in Table 305:

• • The minimum value must be greater than or equal to 3 periods of the \( f_{HRTIM} \) clock
• • The maximum value must be less than or equal to 0xFFFF - 1 periods of the \( f_{HRTIM} \) clock

Table 305. Period and Compare registers min and max values

1. CKPSC[2:0] values < 5 are reserved.

Note: A compare value greater than the period register value will not generate a compare match event.

Counter operating mode

Timer A..E can operate in continuous (free-running) mode or in single-shot manner where counting is started by a reset event, using the CONT bit in the HRTIM_TIMxCR control register. An additional RETRIG bit allows you to select whether the single-shot operation is retriggerable or non-retriggerable. Details of operation are summarized on Table 306 and on Figure 283 and Figure 284 .

Table 306. Timer operating modes

The TxEN bit can be cleared at any time to disable the timer and stop the counting.

Figure 283. Continuous timer operation

Figure 284. Single-shot timer operation

Roll-over event

A counter roll-over event is generated when the counter goes back to 0 after having reached the period value set in the HRTIM_PERxR register in continuous mode.

This event is used for multiple purposes in the HRTIM:

• – To set/reset the outputs
• – To trigger the register content update (transfer from preload to active)
• – To trigger an IRQ or a DMA request
• – To serve as a burst mode clock source or a burst start trigger
• – as an ADC trigger
• – To decrement the repetition counter

If the initial counter value is above the period value when the timer is started, or if a new period is set while the counter is already above this value, the counter is not reset: it will overflow at the maximum period value and the repetition counter will not decrement.

Timer reset

The reset of the timing unit counter can be triggered by up to 30 events that can be selected simultaneously in the HRTIM_RSTxR register, among the following sources:

• • The timing unit: Compare 2, Compare 4 and Update (3 events)
• • The master timer: Reset and Compare 1..4 (5 events)
• • The external events EXTEVNT1..10 (10 events)
• • All other timing units (e.g. Timer B..E for timer A): Compare 1, 2 and 4 (12 events)

Several events can be selected simultaneously to handle multiple reset sources. In this case, the multiple reset requests are ORed. When 2 counter reset events are generated within the same \( f_{HRTIM} \) clock cycle, the last counter reset is taken into account.

Additionally, it is possible to do a software reset of the counter using the TxRST bits in the HRTIM_CR2 register. These control bits are grouped into a single register to allow the simultaneous reset of several counters.

The reset requests are taken into account only once the related counters are enabled (TxCEN bit set).

When the \( f_{HRTIM} \) clock prescaling ratio is above 1, the counter reset event is delayed to the next active edge of the prescaled clock. This allows to maintain a jitterless waveform generation when an output transition is synchronized to the reset event (typically a constant \( T_{on} \) time converter).

Figure 285 shows how the reset is handled for a clock prescaling ratio of 4 ( \( f_{HRTIM} \) divided by 4).

Figure 285. Timer reset resynchronization (prescaling ratio above 32)

Repetition counter

A common software practice is to have an interrupt generated when the period value is reached, so that the maximum amount of time is left for processing before the next period begins. The main purpose of the repetition counter is to adjust the period interrupt rate and off-load the CPU by decoupling the switching frequency and the interrupt frequency.

The timing units have a repetition counter. This counter cannot be read, but solely programmed with an auto-reload value in the HRTIM_REPxR register.

The repetition counter is initialized with the content of the HRTIM_REPxR register when the timer is enabled (TXCEN bit set). Once the timer has been enabled, any time the counter is cleared, either due to a reset event or due to a counter roll-over, the repetition counter is decreased. When it reaches zero, a REP interrupt or a DMA request is issued if enabled (REPIE and REPDE bits in the HRTIM_DIER register).

If the HRTIM_REPxR register is set to 0, an interrupt is generated for each and every period. For any value above 0, a REP interrupt is generated after (HRTIM_REPxR + 1) periods. Figure 286 presents the repetition counter operation for various values, in continuous mode.

Figure 286. Repetition rate vs HRTIM_REPxR content in continuous mode

The repetition counter can also be used when the counter is reset before reaching the period value (variable frequency operation) either in continuous or in single-shot mode (Figure 287 here-below). The reset causes the repetition counter to be decremented, at the exception of the very first start following counter enable (TxCEN bit set).

Figure 287. Repetition counter behavior in single-shot mode

A reset or start event from the hrtim_in_sync[3:1] source causes the repetition to be decremented as any other reset. However, in SYNCIN-started single-shot mode (SYNCSTRTx bit set in the HRTIM_TIMxCR register), the repetition counter will be decremented only on the 1st reset event following the period. Any subsequent reset will not alter the repetition counter until the counter is re-started by a new request on hrtim_in_sync[3:1] inputs.

Set / reset crossbar

A “set” event correspond to a transition to the output active state, while a “reset” event corresponds to a transition to the output inactive state.

The polarity of the waveform is defined in the output stage to accommodate positive or negative logic external components: an active level corresponds to a logic level 1 for a positive polarity (POLx = 0), and to a logic level 0 for a negative polarity (POLx = 1).

Each of the timing units handles the set/reset crossbar for two outputs. These 2 outputs can be set, reset or toggled by up to 32 events that can be selected among the following sources:

• – The timing unit: Period, Compare 1..4, register update (6 events)
• – The master timer: Period, Compare 1..4, HRTIM synchronization (6 events)
• – All other timing units (e.g. Timer B..E for timer A): TIMEVNT1..9 (9 events described in Table 307 )
• – The external events EXTEVNT1..10 (10 events)
• – A software forcing (1 event)

The event sources are ORed and multiple events can be simultaneously selected.

Each output is controlled by two 32-bit registers, one coding for the set (HRTIM_SETxyR) and another one for the reset (HRTIM_RSTxyR), where x stands for the timing unit: A..E and y stands for the output 1or 2 (e.g. HRTIM_SETA1R, HRTIM_RSTC2R,...).

If the same event is selected for both set and reset, it will toggle the output. It is not possible to toggle the output state more than one time per \( t_{\text{HRTIM}} \) period: in case of two consecutive toggling events within the same cycle, only the first one is considered.

The set and reset requests are taken into account only once the counter is enabled (TxCEN bit set), except if the software is forcing a request to allow the prepositioning of the outputs at timer start-up.

Table 307 summarizes the events from other timing units that can be used to set and reset the outputs. The number corresponds to the timer events (such as TIMEVNTx) listed in the register, and empty locations are indicating non-available events.

For instance, Timer A outputs can be set or reset by the following events: Timer B Compare1, 2 and 4, Timer C Compare 2 and 3,... and Timer E Compare 3 will be listed as TIMEVNT8 in HRTIM_SETA1R.

Table 307. Events mapping across Timer A to E

Figure 288 represents how a PWM signal is generated using two compare events.

Figure 288. Compare events action on outputs: set on compare 1, reset on compare 2

Set/Reset on Update events

Half mode

This mode aims at generating square signal with fixed 50% duty cycle and variable frequency (typically for converters using resonant topologies). It allows to have the duty cycle automatically forced to half of the period value when a new period is programmed.

This mode is enabled by writing HALF bit to 1 in the HRTIM_TIMxCR register. When the HRTIM_PERxR register is written, it causes an automatic update of the Compare 1 value with HRTIM_PERxR/2 value.

The output on which a square wave is generated must be programmed to have one transition on CMP1 event, and one transition on the period event, as follows:

• – HRTIM_SETxyR = 0x0000 0008, HRTIM_RSTxyR = 0x0000 0004, or
• – HRTIM_SETxyR = 0x0000 0004, HRTIM_RSTxyR = 0x0000 0008

The HALF mode overrides the content of the HRTIM_CMP1xR register. The access to the HRTIM_PERxR register only causes Compare 1 internal register to be updated. The user-accessible HRTIM_CMP1xR register is not updated with the HRTIM_PERxR / 2 value.

When the preload is enabled (PREEN = 1, MUDIS, TxUDIS), Compare 1 active register is refreshed on the Update event. If the preload is disabled (PREEN= 0), Compare 1 active register is updated as soon as HRTIM_PERxR is written.

The period must be greater than or equal to 6 periods of the \( f_{HRTIM} \) clock when the HALF mode is enabled.

Capture

The timing unit has the capability to capture the counter value, triggered by internal and external events. The purpose is to:

• • measure events arrival timings or occurrence intervals
• • update Compare 2 and Compare 4 values in auto-delayed mode (see Auto-delayed mode ).

The capture is done with \( f_{HRTIM} \) resolution.

The timer has 2 capture registers: HRTIM_CPT1xR and HRTIM_CPT2xR. The capture triggers are programmed in the HRTIM_CPT1xCR and HRTIM_CPT2xCR registers.

The capture of the timing unit counter can be triggered by up to 28 events that can be selected simultaneously in the HRTIM_CPT1xCR and HRTIM_CPT2xCR registers, among the following sources:

• • The external events, EXTEVNT1..10 (10 events)
• • All other timing units (e.g. Timer B..E for timer A): Compare 1, 2 and output 1 set/reset events (16 events)
• • The timing unit: Update (1 event)
• • A software capture (1 event)

Several events can be selected simultaneously to handle multiple capture triggers. In this case, the concurrent trigger requests are ORed. The capture can generate an interrupt or a DMA request when CPTxE and CPTxDE bits are set in the HRTIM_TIMxDIER register.

Over-capture is not prevented by the circuitry: a new capture is triggered even if the previous value was not read, or if the capture flag was not cleared.

Figure 289. Timing unit capture circuitry

Auto-delayed mode

This mode allows to have compare events generated relatively to capture events, so that for instance an output change can happen with a programmed timing following a capture. In this case, the compare match occurs independently from the timer counter value. It enables the generation of waveforms with timings synchronized to external events without the need of software computation and interrupt servicing.

As long as no capture is triggered, the content of the HRTIM_CMPxR register is ignored (no compare event is generated when the counter value matches the Compare value). Once the capture is triggered, the compare value programmed in HRTIM_CMPxR is summed with the captured counter value in HRTIM_CPTxyR, and it updates the internal auto-delayed compare register, as seen on Figure 290. The auto-delayed compare register is internal to the timing unit and cannot be read. The HRTIM_CMPxR preload register is not modified after the calculation.

This feature is available only for Compare 2 and Compare 4 registers. Compare 2 is associated with capture 1, while Compare 4 is associated with capture 2. HRTIM_CMP2xR and HRTIM_CMP4xR Compares cannot be programmed with a value below 3 \( f_{HRTIM} \) clock periods, as in the regular mode.

Figure 290. Auto-delayed overview (Compare 2 only)

The auto-delayed Compare is only valid from the capture up to the period event: once the counter has reached the period value, the system is re-armed with Compare disabled until a capture occurs.

DELCMP2[1:0] and DELCMP4[1:0] bits in HRTIM_TIMxCR register allow to configure the auto-delayed mode as follows:

• • 00
  Regular compare mode: HRTIM_CMP2xR and HRTIM_CMP4xR register contents are directly compared with the counter value.
• • 01
  Auto-delayed mode: Compare 2 and Compare 4 values are recomputed and used for comparison with the counter after a capture 1/2 event.

• • 1X
  Auto-delayed mode with timeout: Compare 2 and Compare 4 values are recomputed and used for comparison with the counter after a capture 1/2 event or after a Compare 1 match ( \( DELCMPx[1:0]= 10 \) ) or a Compare 3 match ( \( DELCMPx[1:0]= 11 \) ) to have a timeout function if capture 1/2 event is missing.

When the capture occurs, the comparison is done with the \( (HRTIM\_CMP2/4xR + HRTIM\_CPT1/2xR) \) value. If no capture is triggered within the period, the behavior depends on the \( DELCMPx[1:0] \) value:

• • \( DELCMPx[1:0] = 01 \) : the compare event is not generated
• • \( DELCMPx[1:0] = 10 \) or \( 11 \) : the comparison is done with the sum of the 2 compares (for instance \( HRTIM\_CMP2xR + HRTIM\_CMP1xR \) ). The captures are not taken into account if they are triggered after \( CMPx + CMP1 \) (resp. \( CMPx + CMP3 \) ).

The captures are enabled again at the beginning of the next PWM period.

If the result of the auto-delayed summation is above 0xFFFF (overflow), the value is ignored and no compare event will be generated until a new period is started.

Note: \( DELCMPx[1:0] \) bitfield must be reset when reprogrammed from one value to the other to re-initialize properly the auto-delayed mechanism, for instance:

• • \( DELCMPx[1:0] = 10 \)
• • \( DELCMPx[1:0] = 00 \)
• • \( DELCMPx[1:0] = 11 \)

As an example, Figure 291 shows how the following signal can be generated:

• • Output set when the counter is equal to Compare 1 value
• • Output reset 4 cycles after a falling edge on a given external event

Note: To simplify the figure, the external event signal is shown without any resynchronization delay: practically, there is a delay of 1 to 2 \( f_{HRTIM} \) clock periods between the falling edge and the capture event due to an internal resynchronization stage which is necessary to process external input signals.

Figure 291. Auto-delayed compare

A regular compare channel (e.g. Compare 1) is used for the output set: as soon as the counter matches the content of the compare register, the output goes to its active state.

A delayed compare is used for the output reset: the compare event can be generated only if a capture event has occurred. No event is generated when the counter matches the delayed compare value (counter = 4). Once the capture event has been triggered by the external event, the content of the capture register is summed to the delayed compare value to have the new compare value. In the example, the auto-delayed value 4 is summed to the capture equal to 7 to give a value of 12 in the auto-delayed compare register. From this time on, the compare event can be generated and will happen when the counter is equal to 12, causing the output to be reset.

Overcapture management in auto-delayed mode

Overcapture is prevented when the auto-delayed mode is enabled (DEL CMPx[1:0] = 01, 10, 11).

When multiple capture requests occur within the same counting period, only the first capture is taken into account to compute the auto-delayed compare value. A new capture is possible only:

• • Once the auto-delayed compare has matched the counter value (compare event)
• • Once the counter has rolled over (period)
• • Once the timer has been reset

Changing auto-delayed compare values

When the auto-delayed compare value is preloaded (PREEN bit set), the new compare value is taken into account on the next coming update event (for instance on the period event), regardless of when the compare register was written and if the capture occurred (see Figure 291 , where the delay is changed when the counter rolls over).

When the preload is disabled (PREEN bit reset), the new compare value is taken into account immediately, even if it is modified after the capture event has occurred, as per the example below:

1. 1. At t1, DEL CMP2 = 1.
2. 2. At t2, CMP2_act = 0x40 => comparison disabled
3. 3. At t3, a capture event occurs capturing the value CPTR1 = 0x20. => comparison enabled, compare value = 0x60
4. 4. At t4, CMP2_act = 0x100 (before the counter reached value CPTR1 + 0x40) => comparison still enabled, new compare value = 0x120
5. 5. At t5, the counter reaches the period value => comparison disabled, cmp2_act = 0x100

Similarly, if the CMP1(CMP3) value changes while DEL CMPx = 10 or 11, and preload is disabled:

1. 1. At t1, DEL CMP2 = 2.
2. 2. At t2, CMP2_act = 0x40 => comparison disabled
3. 3. At t3, CMP3 event occurs - CMP3_act = 0x50 before capture 1 event occurs => comparison enabled, compare value = 0x90
4. 4. At t4, CMP3_act = 0x100 (before the counter reached value 0x90) => comparison still enabled, Compare 2 event will occur at = 0x140

Push-pull mode

This mode primarily aims at driving converters using push-pull topologies. It also needs to be enabled when the delayed idle protection is required, typically for resonant converters (refer to Section 37.3.9: Delayed Protection ).

The push-pull mode is enabled by setting PSHPLL bit in the HRTIM_TIMxCR register.

It applies the signals generated by the crossbar to output 1 and output 2 alternatively, on the period basis, maintaining the other output to its inactive state. The redirection rate (push-pull frequency) is defined by the timer's period event, as shown on Figure 292 . The push-pull period is twice the timer counting period.

Figure 292. Push-pull mode block diagram

The push-pull mode is only available when the timer operates in continuous mode: the counter must not be reset once it has been enabled (TxCEN bit set). It is necessary to disable the timer to stop a push-pull operation and to reset the counter before re-enabling it.

The signal shape is defined using HRTIM_SETxyR and HRTIM_RSTxyR for both outputs. It is necessary to have HRTIM_SETx1R = HRTIM_SETx2R and HRTIM_RSTx1R = HRTIM_RSTx2R to have both outputs with identical waveforms and to achieve a balanced operation. Still, it is possible to have different programming on both outputs for other uses.

Note: The push-pull operation cannot be used when a deadtime is enabled (mutually exclusive functions).

The CPPSAT status bit in HRTIM_TIMxISR indicates on which output the signal is currently active. CPPSTAT is reset when the push-pull mode is disabled.

In the example given on Figure 293 , the timer internal waveform is defined as follows:

• • Output set on period event
• • Output reset on Compare 1 match event

Figure 293. Push-pull mode example

Deadtime

A deadtime insertion unit allows to generate a couple of complementary signals from a single reference waveform, with programmable delays between active state transitions. This is commonly used for topologies using half-bridges or full bridges. It simplifies the software: only 1 waveform is programmed and controlled to drive two outputs.

The Dead time insertion is enabled by setting DTEN bit in HRTIM_OUTxR register. The complementary signals are built based on the reference waveform defined for output 1, using HRTIM_SETx1R and HRTIM_RSTx1R registers: HRTIM_SETx2R and HRTIM_RSTx2R registers are not significant when DTEN bit is set.

Note: The deadtime cannot be used simultaneously with the push-pull mode.

Two deadtimes can be defined in relationship with the rising edge and the falling edge of the reference waveform, as in Figure 294.

Figure 294. Complementary outputs with deadtime insertion

Negative deadtime values can be defined when some control overlap is required. This is done using the deadtime sign bits (SDTFx and SDTRx bits in HRTIM_DTxR register). Figure 295 shows complementary signal waveforms depending on respective signs.

Figure 295. Deadtime insertion vs deadtime sign (1 indicates negative deadtime)

The deadtime values are defined with DTFx[8:0] and DTRx[8:0] bitfields and based on a specific clock prescaled according to DTPRSC[2:0] bits, as follows:

where x is either R or F and \( t_{DTG} = (2^{(DTPRSC[2:0])}) \times t_{HRTIM} \) .

Table 308 gives the resolution and maximum absolute values depending on the prescaler value.

Table 308. Deadtime resolution and max absolute values

1. DTPRSC[2:0] values 000, 001, 010 are reserved.

Figure 296 to Figure 299 present how the deadtime generator behaves for reference waveforms with pulsewidth below the deadtime values, for all deadtime configurations.

Figure 296. Complementary outputs for low pulse width (SDTRx = SDTFx = 0)

Figure 297. Complementary outputs for low pulse width (SDTRx = SDTFx = 1)

Figure 298. Complementary outputs for low pulse width (SDTRx = 0, SDTFx = 1)

Figure 299. Complementary outputs for low pulse width (SDTRx = 1, SDTFx=0)

For safety purposes, it is possible to prevent any spurious write into the deadtime registers by locking the sign and/or the value of the deadtime using DTFLKx, DTRLKx, DTFSLKx and DTRSLKx. Once these bits are set, the related bits and bitfields are becoming read only until the next system reset.

Caution: DTEN bit must not be changed in the following cases:

1. • - When the timer is enabled (TxEN bit set)
   • - When the timer outputs are set/reset by another timer (while TxEN is reset)
2. Otherwise, an unpredictable behavior would result.

It is therefore necessary to disable the timer (TxCEN bit reset) and have the corresponding outputs disabled.

For the particular case where DTEN must be set while the burst mode is enabled with a deadtime upon entry (BME = 1, DIDL = 1, IDLEM = 1), it is necessary to force the two outputs in their IDLES state by software commands (SST, RST bits) before setting DTEN bit. This is to avoid any side effect resulting from a burst mode entry that would happen immediately before a deadtime enable.

37.3.5 Master timer

The main purpose of the master timer is to provide common signals to the 5 timing units, either for synchronization purpose or to set/reset outputs. It does not have direct control over any outputs, but still can be used indirectly by the set/reset crossbars.

Figure 300 provides an overview of the master timer.

Figure 300. Master timer overview

The master timer is based on the very same architecture as the timing units, with the following differences:

• • It does not have outputs associated with, nor output related control
• • It does not have its own crossbar unit, nor push-pull or deadtime mode
• • It can only be reset by the external synchronization circuitry
• • It does not have a capture unit, nor the auto-delayed mode
• • It does not include external event blanking and windowing circuitry
• • It has a limited set of interrupt / DMA requests: Compare 1..4, repetition, register update and external synchronization event.

The master timer control register includes all the timer enable bits, for the master and Timer A..E timing units. This allows to have all timer synchronously started with a single write access.

It also handles the external synchronization for the whole HRTIM timer (see Section 37.3.17: Synchronizing the HRTIM with other timers or HRTIM instances ), with both MCU internal and external (inputs/outputs) resources.

Master timer control registers are mapped with the same offset as the timing units' registers.

37.3.6 Set/reset events priorities and narrow pulses management

This section describes how the output waveform is generated when several set and/or reset requests are occurring within 3 consecutive \( t_{HRTIM} \) periods.

An arbitration is performed during each \( t_{HRTIM} \) period, in 2 steps:

1. 1. For each active event, the desired output transition is determined (set, reset or toggle).
2. 2. A predefined arbitration is performed among the active events (from highest to lowest priority \( CMP4 \rightarrow CMP3 \rightarrow CMP2 \rightarrow CMP1 \rightarrow PER \) , see Concurrent set request / Concurrent reset requests ).

When set and reset requests from two different sources are simultaneous, the reset action has the highest priority.

Concurrent set request / Concurrent reset requests

When multiple sources are selected for a set event, an arbitration is performed when the set requests occur within the same \( f_{HRTIM} \) clock period.

In case of multiple requests from adjacent timers (TIMEVNT1..9), the request which occurs first is taken into account. The arbitration is done in 2 steps, depending on the source (from the highest to the lowest priority): \( CMP4 \rightarrow CMP3 \rightarrow CMP2 \rightarrow CMP1 \) .

If multiple requests from the master timer occur within the same \( f_{HRTIM} \) clock period, a predefined arbitration is applied and a single request will be taken into account (from the highest to the lowest priority):

\( MSTCMP4 \rightarrow MSTCMP3 \rightarrow MSTCMP2 \rightarrow MSTCMP1 \rightarrow MSTCMPER \)

When multiple requests internal to the timer occur within the same \( f_{HRTIM} \) clock period, a predefined arbitration is applied and the requests are taken with the following priority, whatever the effective timing (from highest to lowest):

\( CMP4 \rightarrow CMP3 \rightarrow CMP2 \rightarrow CMP1 \rightarrow PER \)

Note: Practically, this is of a primary importance only when using auto-delayed Compare 2 and Compare 4 simultaneously (i.e. when the effective set/reset cannot be determined a priori because it is related to an external event). In this case, the highest priority signal must be affected to the CMP4 event.

Last, the highest priority is given to non timing-related: EXTEVNT1..10, RESYNC (coming from SYNC event if SYNCIRSTx or SYNCSTRTx is set or from a software reset), update and software set (SST).

As a summary, in case of simultaneous events, the effective set (reset) event will be arbitrated between:

• • Any TIMEVNT1..9 event
• • A single source from the master (as per the fixed arbitration given above)
• • A single source from the timer
• • The “non timing-related events”.

The same arbitration principle applies for concurrent reset requests. In this case, the reset request has the highest priority.

A set or reset event occurring within the prescaler clock cycle is delayed to the next active edge of the prescaled clock (as for a counter reset), even if the arbitration is still performed every \( t_{\text{HRTIM}} \) cycle.

If a reset event is followed by a set event within the same prescaler clock cycle, the latest event will be considered.

37.3.7 External events global conditioning

The HRTIM timer can handle events not generated within the timer, referred to as “external event”. These external events come from multiple sources, either on-chip or off-chip:

• • built-in comparators,
• • digital input pins (typically connected to off-chip comparators and zero-crossing detectors),
• • on-chip events for other peripheral (ADC’s analog watchdogs and general purpose timer trigger outputs).

The external events conditioning circuitry allows to select the signal source for a given channel (with a 4:1 multiplexer) and to convert it into an information that can be processed by the crossbar unit (for instance, to have an output reset triggered by a falling edge detection on an external event channel).

Up to 10 external event channels can be conditioned and are available simultaneously for any of the 5 timers. This conditioning is common to all timers, since this is usually dictated by external components (such as a zero-crossing detector) and environmental conditions (typically the filter set-up will be related to the applications noise level and signature).

Figure 301 presents an overview of the conditioning logic for a single channel.

Figure 301. External event conditioning overview (1 channel represented)

The 10 external events are initialized using the HRTIM_EECR1 and HRTIM_EECR2 registers:

• • to select up to 4 sources with the EExSRC[1:0] bits,
• • to select the sensitivity with EExSNS[1:0] bits, to be either level-sensitive or edge-sensitive (rising, falling or both),
• • to select the polarity, in case of a level sensitivity, with EExPOL bit,
• • to have a low latency mode, with EExFAST bits (see Latency to external events ), for external events 1 to 5.

Note: The external events used as triggers for reset, capture, burst mode, ADC triggers and delayed protection are edge-sensitive even if EExSNS bit is reset (level-sensitive selection): if POL = 0 the trigger is active on external event rising edge, while if POL = 1 the trigger is active on external event falling edge.

The external events are discarded as long as the counters are disabled (TxCEN bit reset) to prevent any output state change and counter reset, except if they are used as ADC triggers.

Additionally, it is possible to enable digital noise filters, for external events 6 to 10, using EExF[3:0] bits in the HRTIM_EECR3 register.

A digital filter is made of a counter in which a number N of valid samples is needed to validate a transition on the output. If the input value changes before the counter has

reached the value N, the counter is reset and the transition is discarded (considered as a spurious event). If the counter reaches N, the transition is considered as valid and transmitted as a correct external event. Consequently, the digital filter adds a latency to the external events being filtered, depending on the sampling clock and on the filter length (number of valid samples expected).

The sampling clock is either the \( f_{HRTIM} \) clock or a specific prescaled clock \( f_{EEV_{S}} \) derived from \( f_{HRTIM} \) , defined with EEVSD[1:0] bits in HRTIM_EECR3 register.

Table 309 summarizes the available sources and features associated with each of the 10 external events channels.

Table 309. External events mapping and associated features

1. 1. OPAMP1_VOUT can be used as High-resolution timer internal event source. In this case, OPAMP1_VOUT (PC4) pin must be configured in input mode. The data from the GPIO pin is redirect to the HRTIM external events through the pin Schmitt trigger. If OPAMP1 is disabled, PC4 pin, configured in input mode, can be used as HRTIM external events.

Latency to external events

The external event conditioning gives the possibility to adjust the external event processing time (and associated latency) depending on performance expectations:

• • A regular operating mode, in which the external event is resampled with the clock before acting on the output crossbar. This adds some latency but gives access to all crossbar functionalities. It enables the generation of an externally triggered high-resolution pulse.
• • A fast operating mode, in which the latency between the external event and the action on the output is minimized. This mode is convenient for ultra-fast over-current protections, for instance.

EExFAST bits in the HRTIM_EECR1 register allow to define the operating for channels 1 to 5. This influences the latency and the jitter present on the output pulses, as summarized in the table below.

The EExFAST mode is only available with level-sensitive programming (EExSNS[1:0] = 00); the edge-sensitivity cannot be programmed.

It is possible to apply event filtering to external events (both blanking and windowing with EExFLTR[3:0] != 0000, see Section 37.3.8 ). In this case, EExLTCHx bit must be reset: the postponed mode is not supported, neither the windowing timeout feature.

Note: The external event configuration (source and polarity) must not be modified once the related EExFAST bit is set.

A fast external event cannot be used to toggle an output: it must be enabled either in HRTIM_SETxyR or HRTIM_RSTxyR registers, not in both.

When a set and a reset event - from 2 independent fast external events - occur simultaneously, the reset has the highest priority in the crossbar and the output becomes inactive.

When EExFAST bit is set, the output cannot be changed during the 11 \( f_{\text{HRTIM}} \) clock periods following the external event.

Figure 302 and Figure 303 give practical examples of the reaction time to external events, for output set/reset and counter reset.

Figure 302. Latency to external events falling edge (counter reset and output set)

Figure 303. Latency to external events (output reset on external event)

37.3.8 External event filtering in timing units

Once conditioned, the 10 external events are available for all timing units.

They can be used directly and are active as soon as the timing unit counter is enabled (TxCEN bit set).

They can also be filtered to have an action limited in time, usually related to the counting period. Two operations can be performed:

• • blanking, to mask external events during a defined time period,
• • windowing, to enable external events only during a defined time period.

These modes are enabled using HRTIM_EExFLTR[3:0] bits in the HRTIM_EEFxR1 and HRTIM_EEFxR2 registers. Each of the 5 TimerA..E timing units has its own programmable filter settings for the 10 external events.

Blanking mode

In event blanking mode (see Figure 304 ), the external event is ignored if it happens during a given blanking period. This is convenient, for instance, to avoid a current limit to trip on switching noise at the beginning of a PWM period. This mode is active for EExFLTR[3:0] bitfield values ranging from 0001 to 1100.

Figure 304. Event blanking mode

In event postpone mode, the external event is not taken into account immediately but is memorized (latched) and generated as soon as the blanking period is completed, as shown on Figure 305 . This mode is enabled by setting EExLTCH bit in HRTIM_EEFxR1 and HRTIM_EEFxR2 registers.

Figure 305. Event postpone mode

The blanking signal comes from several sources:

• the timer itself: the blanking lasts from the counter reset to the compare match (EExFLTR[3:0] = 0001 to 0100 for Compare 1 to Compare 4)
• from other timing units (EExFLTR[3:0] = 0101 to 1100): the blanking lasts from the selected timing unit counter reset to one of its compare match, or can be fully programmed as a waveform on Tx2 output. In this case, events are masked as long as the Tx2 signal is inactive (it is not necessary to have the output enabled, the signal is taken prior to the output stage).

The EExFLTR[3:0] configurations from 0101 to 1100 are referred to as TIMFLTR1 to TIMFLTR8 in the bit description, and differ from one timing unit to the other. Table 311 gives the 8 available options per timer: CMPx refers to blanking from counter reset to compare match, Tx2 refers to the timing unit TIMx output 2 waveform defined with HRTIM_SETx2 and HRTIM_RSTx2 registers. For instance, Timer B (TIMFLTR6) is Timer C output 2 waveform.

Table 311. Filtering signals mapping per time

Figure 306 and Figure 307 give an example of external event blanking for all edge and level sensitivities, in regular and postponed modes.

Figure 306. External trigger blanking with edge-sensitive trigger

Figure 307. External trigger blanking, level sensitive triggering

Windowing mode

In event windowing mode, the event is taken into account only if it occurs within a given time window, otherwise it is ignored. This mode is active for EExFLTR[3:0] ranging from 1101 to 1111.

Figure 308. Event windowing mode

EExLTCH bit in EEFxR1 and EEFxR2 registers allows to latch the signal, if set to 1: in this case, an event is accepted if it occurs during the window but is delayed at the end of it.

• • If EExLTCH bit is reset and the signal occurs during the window, it is passed through directly.
• • If EExLTCH bit is reset and no signal occurs, a timeout event is generated at the end of the window.

A use case of the windowing mode is to filter synchronization signals. The timeout generation allows to force a default synchronization event, when the expected synchronization event is lacking (for instance during a converter start-up).

There are 3 sources for each external event windowing, coded as follows:

• • 1101 and 1110: the windowing lasts from the counter reset to the compare match (respectively Compare 2 and Compare 3)
• • 1111: the windowing is related to another timing unit and lasts from its counter reset to its Compare 2 match. The source is described as TIMWIN in the bit description and is given in Table 312 . As an example, the external events in timer B can be filtered by a window starting from timer A counter reset to timer A Compare 2.

Table 312. Windowing signals mapping per timer (EEFLTR[3:0] = 1111)

Note: The timeout event generation is not supported if the external event is programmed in fast mode.

Figure 309 and Figure 310 present how the events are generated for the various edge and level sensitivities, as well as depending on EExLTCH bit setting. Timeout events are specifically mentioned for clarity reasons.

Figure 309. External trigger windowing with edge-sensitive trigger

Figure 310. External trigger windowing, level sensitive triggering

37.3.9 Delayed Protection

The HRTIM features specific protection schemes, typically for resonant converters when it is necessary to shut down the PWM outputs in a delayed manner, either once the active pulse is completed or once a push-pull period is completed. These features are enabled with DLYPRTEN bit in the HRTIM_OUTxR register, and are using specific external event channels.

Delayed Idle

In this mode, the active pulse is completed before the protection is activated. The selected external event causes the output to enter in idle mode at the end of the active pulse (defined by an output reset event in HRTIM_RSTx1R or HRTIM_RSTx2R).

Once the protection is triggered, the idle mode is permanently maintained but the counter continues to run, until the output is re-enabled. Tx1OEN and Tx2OEN bits are not affected by the delayed idle entry. To exit from delayed idle and resume operation, it is necessary to overwrite Tx1OEN and Tx2OEN bits to 1. The output state will change on the first transition to an active state following the output enable command.

Note: The delayed idle mode cannot be exited immediately after having been entered, before the active pulse is completed: it is mandatory to make sure that the outputs are in idle state before resuming the run mode. This can be done by waiting up to the next period, for instance, or by polling the O1CPY and/or O2CPY status bits in the TIMxISR register.

The delayed idle mode can be applied to a single output (DLYPRT[2:0] = x00 or x01) or to both outputs (DLYPRT[2:0] = x10).

An interrupt or a DMA request can be generated in response to a Delayed Idle mode entry. The DLYPRT flag in HRTIM_TIMxISR is set as soon as the external event arrives, independently from the end of the active pulse on output.

When the Delayed Idle mode is triggered, the output states can be determined using O1STAT and O2STAT in HRTIM_TIMxISR. Both status bits are updated even if the delayed idle is applied to a single output. When the push-pull mode is enabled, the IPPSTAT flag in HRTIM_TIMxISR indicates during which period the delayed protection request occurred.

This mode is available whatever the timer operating mode (regular, push-pull, deadtime). It is available with 2 external events only:

• • hrtim_evt6 and hrtim_evt7 for Timer A, B and C
• • hrtim_evt8 and hrtim_evt9 for Timer D and E

The delayed protection mode can be triggered only when the counter is enabled (TxCEN bit set). It remains active even if the TxEN bit is reset, until the TxyOEN bits are set.

Figure 311. Delayed Idle mode entry

The delayed idle mode has a higher priority than the burst mode: any burst mode exit request is discarded once the delayed idle protection has been triggered. On the contrary, If the delayed protection is exited while the burst mode is active, the burst mode will be resumed normally and the output will be maintained in the idle state until the burst mode exits. Figure 312 gives an overview of these different scenarios.

Figure 312. Burst mode and delayed protection priorities (DIDL = 0)

The same priorities are applied when the delayed burst mode entry is enabled (DIDL bit set), as shown on Figure 313 below.

Figure 313. Burst mode and delayed protection priorities (DIDL = 1)

Balanced Idle

Only available in push-pull mode, it allows to have balanced pulsemode on the two outputs when one of the active pulse is shortened due to a protection. The pulsemode, which was terminated earlier than programmed, is copied on the alternate output and the two outputs are then put in idle state, until the normal operation is resumed by software. This mode is enabled by writing x11 in DLYPRT[2:0] bitfield in HRTIM_OUTxR.

This mode is available with 2 external events only:

• • hrtim_evt6 and hrtim_evt7 for Timer A, B and C
• • hrtim_evt8 and hrtim_evt9 for Timer D and E

Figure 314. Balanced Idle protection example

When the balanced Idle mode is enabled, the selected external event triggers a capture of the counter value into the Compare 4 active register (this value is not user-accessible). The push-pull is maintained for one additional period so that the shorten pulse can be repeated: a new output reset event is generated while the regular output set event is maintained.

The Idle mode is then entered and the output takes the level defined by IDLESx bits in the HRTIM_OUTxR register. The balanced idle mode entry is indicated by the DLYPRT flag, while the IPPSTAT flag indicates during which period the external event occurred, to determine the sequence of shorten pulses (HRTIM_CHA1 then HRTIM_CHA2 or vice versa).

The timer operation is not interrupted (the counter continues to run).

To enable the balanced idle mode, it is necessary to have the following initialization:

• – timer operating in continuous mode (CONT = 1)
• – Push-pull mode enabled
• – HRTIM_CMP4xR must be set to 0 and the content transferred into the active register (for instance by forcing a software update)
• – DELCMP4[1:0] bit field must be set to 00 (auto-delayed mode disabled)
• – DLYPRT[2:0] = x11 (delayed protection enable)

Note: The HRTIM_CMP4xR register must not be written during a balanced idle operation. The CMP4 event is reserved and cannot be used for another purpose.

In balanced idle mode, it is recommended to avoid multiple external events or software-based reset events causing an output reset. If such an event arrives before a balanced idle request within the same period, it will cause the output pulses to be unbalanced (1st pulse length defined by the external event or software reset, while the 2nd pulse is defined by the balanced idle mode entry).

The minimum pulselength that can be handled in balanced idle mode is 4 f _HRTIM clock periods.

If the capture occurs before the counter has reached this minimum value, the current pulse is extended up to 4 f _HRTIM clock periods before being copied into the secondary output. In any case, the pulselengths are always balanced.

Tx1OEN and Tx2OEN bits are not affected by the balanced idle entry. To exit from balanced idle and resume the operation, it is necessary to overwrite Tx1OEN and Tx2OEN bits to 1 simultaneously. The output state will change on the first active transition following the output enable.

It is possible to resume operation similarly to the delayed idle entry. For instance, if the external event arrives while output 1 is active (delayed idle effective after output 2 pulse), the re-start sequence can be initiated for output 1 first. To do so, it is necessary to poll CPPSTAT bit in the HRTIM_TIMxISR register. Using the above example (IPPSTAT flag equal to 0), the operation will be resumed when CPPSTAT bit is 0.

In order to have a specific re-start sequence, it is possible to poll the CPPSTAT to know which output will be active first. This allows, for instance, to re-start with the same sequence as the idle entry sequence: if EEV arrives during output 1 active, the re-start sequence will be initiated when the output 1 is active (CPPSTAT = 0).

Note: The balanced idle mode must not be disabled while a pulse balancing sequence is ongoing. It is necessary to wait until the CMP4 flag is set, thus indicating that the sequence is completed, to reset the DLYPRTEN bit.

The balanced idle protection mode can be triggered only when the counter is enabled (TxCEN bit set). It remains active even if the TxCEN bit is reset, until TxyOEN bits are set.

Balanced idle can be used together with the burst mode under the following conditions:

• • TxBM bit must be reset (counter clock maintained during the burst, see Section 37.3.13 ),
• • No balanced idle protection must be triggered while the outputs are in a burst idle state.

The balanced idle mode has a higher priority than the burst mode: any burst mode exit request is discarded once the balanced idle protection has been triggered. On the contrary, if the delayed protection is exited while the burst mode is active, the burst mode will be resumed normally.

Note: Although the output state is frozen in idle mode, a number of events are still generated on the auxiliary outputs (see Section 37.3.16 ) during the idle period following the delayed protection:

• - Output set/reset interrupt or DMA requests
• - External event filtering based on output signal
• - Capture events triggered by set/reset

37.3.10 Register preload and update management

Most of HRTIM registers are buffered and can be preloaded if needed. Typically, this allows to prevent the waveforms from being altered by a register update not synchronized with the active events (set/reset).

When the preload mode is enabled, accessed registers are shadow registers. Their content is transferred into the active register after an update request, either software or synchronized with an event.

By default, PREEN bits in HRTIM_MCR and HRTIM_TIMxCR registers are reset and the registers are not preloaded: any write directly updates the active registers. If PREEN bit is reset while the timer is running and preload was enabled, the content of the preload registers is directly transferred into the active registers.

Each timing unit and the master timer have their own PREEN bit. If PRREN is set, the preload registers are enabled and transferred to the active register only upon an update event.

There are two options to initialize the timer when the preload feature is needed:

• • Enable PREEN bit at the very end of the timer initialization to have the preload registers transferred into the active registers before the timer is enabled (by setting MCEN and TxCEN bits).
• • enable PREEN bit at any time during the initialization and force a software update immediately before starting.

Table 313 lists the registers which can be preloaded, together with a summary of available update events.

Table 313. HRTIM preloadable control registers and associated update sources

The master timer has 4 update options:

1. 1. Software: writing 1 into MSWU bit in HRTIM_CR2 forces an immediate update of the registers. In this case, any pending hardware update request is cancelled.
2. 2. Update done when the master counter rolls over and the master repetition counter is equal to 0. This is enabled when MREPU bit is set in HRTIM_MCR.
3. 3. Update done once Burst DMA is completed (see Section 37.3.21 for details). This is enabled when BRSTDMA[1:0] = 01 in HRTIM_MCR. It is possible to have both MREPU=1 and BRSTDMA=01.

Note: The update can take place immediately after the end of the burst sequence if SWU bit is set (i.e. forced update mode). If SWU bit is reset, the update will be done on the next update event following the end of the burst sequence.

1. 4. Update done when the master counter rolls over following a Burst DMA completion. This is enabled when BRSTDMA[1:0] = 10 in HRTIM_MCR.

An interrupt or a DMA request can be generated by the master update event.

Each timer (TIMA..E) can also have the update done as follows:

• • By software: writing 1 into TxSWU bit in HRTIM_CR2 forces an immediate update of the registers. In this case, any pending hardware update request is canceled.
• • Update done when the counter rolls over and the repetition counter is equal to 0. This is enabled when TxREPU bit is set in HRTIM_TIMxCR.
• • Update done when the counter is reset or rolls over in continuous mode. This is enabled when TxRSTU bit is set in HRTIM_TIMxCR. This is used for a timer operating in single-shot mode, for instance.
• • Update done once a Burst DMA is completed. This is enabled when UPDGAT[3:0] = 0001 in HRTIM_TIMxCR.
• • Update done on the update event following a Burst DMA completion (the event can be enabled with TxREPU, MSTU or TxU). This is enabled when UPDGAT[3:0] = 0010 in HRTIM_TIMxCR.
• • Update done when receiving a request on the update enable input 1..3. This is enabled when UPDGAT[3:0] = 0011, 0100, 0101 in HRTIM_TIMxCR.
• • Update done on the update event following a request on the update enable input 1..3 (the event can be enabled with TxREPU, MSTU or TxU). This is enabled when UPDGAT[3:0] = 0110, 0111, 1000 in HRTIM_TIMxCR
• • Update done synchronously with any other timer or master update (for instance TIMA can be updated simultaneously with TIMB). This is used for converters requiring several timers, and is enabled by setting bits MSTU and TxU in HRTIM_TIMxCR register.

The update enable inputs 1..3 allow to have an update event synchronized with on-chip events coming from the general-purpose timers. These inputs are rising-edge sensitive.

Table 314 lists the connections between update enable inputs and the on-chip sources.

Table 314. Update enable inputs and sources

This allows to synchronize low frequency update requests with high-frequency signals (for instance an update on the counter roll-over of a 100 kHz PWM that has to be done at a 100 Hz rate).

Note: The update events are synchronized to the prescaler clock when CKPSC[2:0] > 5.

An interrupt or a DMA request can be generated by the Timx update event.

MUDIS and TxUDIS bits in the HRTIM_CR1 register allow to temporarily disable the transfer from preload to active registers, whatever the selected update event. This allows to modify several registers in multiple timers. The regular update event takes place once these bits are reset.

MUDIS and TxUDIS bits are all grouped in the same register. This allows the update of multiple timers (not necessarily synchronized) to be disabled and resumed simultaneously.

The following example is a practical use case. A first power converter is controlled with the master, TIMB and TIMC. TIMB and TIMC must be updated simultaneously with the master timer repetition event. A second converter works in parallel with TIMA, TIMD and TIME, and TIMD, TIME must be updated with TIMA repetition event.

First converter

In HRTIM_MCR, MREPU bit is set: the update will occur at the end of the master timer counter repetition period. In HRTIM_TIMBCR and HRTIM_TIMCCR, MSTU bits are set to have TIMB and TIMC timers updated simultaneously with the master timer.

When the power converter set-point has to be adjusted by software, MUDIS, TBUDIS and TCUDIS bits of the HRTIM_CR register must be set prior to write accessing registers to update the values (for instance the compare values). From this time on, any hardware update request is ignored and the preload registers can be accessed without any risk to have them transferred into the active registers. Once the software processing is over, MUDIS, TBUDIS and TCUDIS bits must be reset. The transfer from preload to active registers will be done as soon as the master repetition event occurs.

Second converter

In HRTIM_TIMACR, TAREPU bit is set: the update will occur at the end of the Timer A counter repetition period. In HRTIM_TIMDCR and HRTIM_TIMECR, TAU bits are set to have TIMD and TIME timers updated simultaneously with Timer A.

When the power converter set-point has to be adjusted by software, TAUDIS, TDUDIS and TEUDIS bits of the HRTIM_CR register must be set prior to write accessing the registers to update the values (for instance the compare values). From this time on, any hardware update request is ignored and the preload registers can be accessed without any risk to have them transferred into the active registers. Once the software processing is over, TAUDIS, TDUDIS and TEUDIS bits can be reset: the transfer from preload to active registers will be done as soon as the Timer A repetition event occurs.

37.3.11 Events propagation within or across multiple timers

The HRTIM offers many possibilities for cascading events or sharing them across multiple timing units, including the master timer, to get full benefits from its modular architecture. These are key features for converters requiring multiple synchronized outputs.

This section summarizes the various options and specifies whether and how an event is propagated within the HRTIM.

TIMx update triggered by the Master timer update

The sources listed in Table 315 are generating a master timer update. The table indicates if the source event can be used to trigger a simultaneous update in any of TIMx timing units.

Operating condition: MSTU bit is set in HRTIM_TIMxCR register.

TIMx update triggered by the TIMy update

The sources listed in Table 316 are generating a TIMy update. The table indicates if the given event can be used to trigger a simultaneous update in another or multiple TIMx timers.

Operating condition: TyU bit set in HRTIM_TIMxCR register (source = TIMy and destination = TIMx).

TIMx Counter reset causing a TIMx update

Table 317 lists the counter reset sources and indicates whether they can be used to generate an update.

Operating condition: TxRSTU bit in HRTIM_TIMxCR register.

TIMx update causing a TIMx counter reset

Table 318 lists the update event sources and indicates whether they can be used to generate a counter reset.

Operating condition: UPDT bit set in HRTIM_RSTxR.

Table 318. Update event propagation for a timer reset

37.3.12 Output management

Each timing unit controls a pair of outputs. The outputs have three operating states:

• • RUN: this is the main operating mode, where the output can take the active or inactive level as programmed in the crossbar unit.
• • IDLE: this state is the default operating state after an HRTIM reset, when the outputs are disabled by software or during a burst mode operation (where outputs are temporary disabled during a normal operating mode; refer to Section 37.3.13 for more details). It is either permanently active or inactive.
• • FAULT: this is the safety state, entered in case of a shut-down request on FAULTx inputs. It can be permanently active, inactive or Hi-Z.

The output status is indicated by TxyOEN bit in HRTIM_OENR register and TxyODS bit in HRTIM_ODSR register, as in Table 319 .

TxyOEN bit is both a control and a status bit: it must be set by software to have the output in RUN mode. It is cleared by hardware when the output goes back in IDLE or FAULT mode. When TxyOEN bit is cleared, TxyODS bit indicates whether the output is in the IDLE or FAULT state. A third bit in the HRTIM_ODISR register allows to disable the output by software.

Figure 315. Output management overview

Figure 316 summarizes the bit values for the three states and how the transitions are triggered. Faults can be triggered by any external or internal fault source, as listed in Section 37.3.15 , while the Idle state can be entered when the burst mode or delayed protections are active.

Figure 316. HRTIM output states and transitions

The FAULT and IDLE levels are defined as active or inactive. Active (or inactive) refers to the level on the timer output that causes a power switch to be closed (or opened for an inactive state).

The IDLE state has the highest priority: the transition FAULT → IDLE is possible even if the FAULT condition is still valid, triggered by ODIS bit set.

The FAULT state has priority over the RUN state: if TxyOEN bit is set simultaneously with a Fault event, the FAULT state will be entered. The condition is given on the transition IDLE →

FAULT, as in Figure 316 : fault protection needs to be enabled (FAULTx[1:0] bits = 01, 10, 11) and the Txy OEN bit set with a fault active (or during a breakpoint if DBG_HRTIM_STOP = 1).

The output polarity is programmed using POLx bits in HRTIM_OUTxR. When POLx = 0, the polarity is positive (output active high), while it is active low in case of a negative polarity (POLx = 1). Practically, the polarity is defined depending on the power switch to be driven (PMOS vs. NMOS) or on a gate driver polarity.

The output level in the FAULT state is configured using FAULTx[1:0] bits in HRTIM_OUTxR, for each output, as follows:

• • 00: output never enters the fault state and stays in RUN or IDLE state
• • 01: output at active level when in FAULT
• • 10: output at inactive level when in FAULT
• • 11: output is tri-stated when in FAULT. The safe state must be forced externally with pull-up or pull-down resistors, for instance.

Note: FAULTx[1:0] bits must not be changed as long as the outputs are in FAULT state.

The level of the output in IDLE state is configured using IDLESx bit in HRTIM_OUTxR, as follows:

• • 0: output at inactive level when in IDLE
• • 1: output at active level when in IDLE

When TxyOEN bit is set to enter the RUN state, the output is immediately connected to the crossbar output. If the timer clock is stopped, the level will either be inactive (after an HRTIM reset) or correspond to the RUN level (when the timer was stopped and the output disabled).

During the HRTIM initialization, the output level can be prepositioned prior to have it in RUN mode, using the software forced output set and reset in the HRTIM_SETx1R and HRTIM_RSTx1R registers.

37.3.13 Burst mode controller

The burst mode controller allows to have the outputs alternatively in IDLE and RUN state, by hardware, so as to skip some switching periods with a programmable periodicity and duty cycle.

Burst mode operation is of common use in power converters when operating under light loads. It can significantly increase the efficiency of the converter by reducing the number of transitions on the outputs and the associated switching losses.

When operating in burst mode, one or a few pulses are outputs followed by an idle period equal to several counting periods, typically, where no output pulses are produced, as shown in the example on Figure 317 .

Figure 317. Burst mode operation example

The burst mode controller consists of:

• • A counter that can be clocked by various sources, either within or outside the HRTIM (typically the end of a PWM period).
• • A compare register to define the number of idle periods: HRTIM_BMCOMP.
• • A period register to define the burst repetition rate (corresponding to the sum of the idle and run periods): HRTIM_BMPER.

The burst mode controller is able to take over the control of any of the 10 PWM outputs. The state of each output during a burst mode operation is programmed using IDLESx and IDLEMx bits in the HRTIM_OUTxR register, as in Table 320 .

Table 320. Timer output programming for burst mode

Note: IDLEMx bit must not be changed while the burst mode is active.

The burst mode controller only acts on the output stage. A number of events are still generated during the idle period:

• • Output set/reset interrupt or DMA requests
• • External event filtering based on Tx2 output signal
• • Capture events triggered by output set/reset

During the burst mode, neither start nor reset events are generated on the HRTIM_SCOUT output, even if TxBM bit is set.

Operating mode

It is necessary to have the counter enabled (TxCEN bit set) before using the burst mode on a given timing unit. The burst mode is enabled with BME bit in the HRTIM_BMCR register.

It can operate in continuous or single-shot mode, using BMOM bit in the HRTIM_BMCR register. The continuous mode is enabled when BMOM = 1. The Burst operation is maintained until BMSTAT bit in HRTIM_BMCR is reset to terminate it.

In single-shot mode (BMOM = 0), the idle sequence is executed once, following the burst mode trigger, and the normal timer operation is resumed immediately after.

The duration of the idle and run periods is defined with a burst mode counter and 2 registers. The HRTIM_BMCMR register defines the number of counts during which the selected timer(s) are in an idle state (idle period). HRTIM_BMPER defines the overall burst mode period (sum of the idle and run periods). Once the initial burst mode trigger has occurred, the idle period length is HRTIM_BMCMR+1, the overall burst period is HRTIM_BMPER+1.

Note: The burst mode period must not be less than or equal to the deadtime duration defined with DTRx[8:0] and DTFx[8:0] bitfields.

The counters of the timing units and the master timer can be stopped and reset during the burst mode operation. HRTIM_BMCR holds 6 control bits for this purpose: MTBM (master) and TABM..TEBM for Timer A..E.

When MTBM or TxBM bit is reset, the counter clock is maintained. This allows to keep a phase relationship with other timers in multiphase systems, for instance.

When MTBM or TxBM bit is set, the corresponding counter is stopped and maintained in reset state during the burst idle period. This allows to have the timer restarting a full period when exiting from idle. If SYNCSRC[1:0] = 00 or 10 (synchronization output on the master start or timer A start), a pulse is sent on the HRTIM_SCOUT output when exiting the burst mode.

Note: TxBM bit must not be set when the balanced idle mode is active (DLYPRT[1:0] = 0x11).

Burst mode clock

The burst mode controller counter can be clocked by several sources, selected with BMCLK[3:0] bits in the HRTIM_BMCR register:

• • BMCLK[3:0] = 0000 to 0101: Master timer and TIMA..E reset/roll-over events. This allows to have burst mode idle and run periods aligned with the timing unit counting period (both in free-running and counter reset mode).
• • BMCLK[3:0] = 0110 to 1001: The clocking is provided by the general purpose timers, as in Table 321 . In this case, the burst mode idle and run periods are not necessarily aligned with timing unit counting period (a pulse on the output may be interrupted, resulting a waveform with modified duty cycle for instance).
• • BMCLK[3:0] = 1010: The \( f_{HRTIM} \) clock prescaled by a factor defined with BMPRSC[3:0] bits in HRTIM_BMCR register. In this case, the burst mode idle and run periods are not necessarily aligned with the timing unit counting period (a pulse on the output may be interrupted, resulting in a waveform with a modified duty cycle, for instance).

The pulsewidth on TIMxx OC output must be at least \( N_{f_{HRTIM}} \) clock cycles long to be detected by the HRTIM burst mode controller.

Burst mode triggers

To trigger the burst operation, 32 sources are available and are selected using the HRTIM_BMTRGR register:

• • Software trigger (set by software and reset by hardware)
• • 6 Master timer events: repetition, reset/roll-over, Compare 1 to 4
• • 5 x 4 events from timers A..E: repetition, reset/roll-over, Compare 1 and 2
• • hrtim_evt7 (including TIMA event filtering) and hrtim_evt8 (including TIMD event filtering)
• • Timer A period following hrtim_evt7 (including TIMA event filtering)
• • Timer D period following hrtim_evt8 (including TIMD event filtering)
• • On-chip events coming from other general purpose timer (hrtim_bm_trg output: TIM7_TRGO output)

These sources can be combined to have multiple concurrent triggers.

Burst mode is not re-triggerable. In continuous mode, new triggers are ignored until the burst mode is terminated, while in single-shot mode, the triggers are ignored until the current burst completion including run periods (HRTIM_BMPER+1 cycles). This is also valid for software trigger (the software bit is reset by hardware even if it is discarded).

Figure 318 shows how the burst mode is started in response to an external event, either immediately or on the timer period following the event.

For TAEEV7 and TDEEV8 combined triggers (trigger on a Timer period following an external event), the external event detection is always active, regardless of the burst mode programming and the on-going burst operation:

• • When the burst mode is enabled (BME=1) or the trigger is enabled (TAEEV7 or TDEEV8 bit set in the BMTRG register) in between the external event and the timer period event, the burst is triggered.
• • The single-shot burst mode is re-triggered even if the external event occurs before the burst end (as long as the corresponding period happens after the burst).

Note: TAEEV7 and TDEEV8 triggers are valid only after a period event. If the counter is reset before the period event, the pending hrtim_evt7/8 event is discarded.

Burst mode delayed entry

By default, the outputs are taking their idle level (as per IDLES1 and IDLES2 setting) immediately after the burst mode trigger.

It is also possible to delay the burst mode entry and force the output to an inactive state during a programmable period before the output takes its idle state. This is useful when driving two complementary outputs, one of them having an active idle state, to avoid a deadtime violation as shown on Figure 319 . This prevents any risk of shoot through current in half-bridges, but causes a delayed response to the burst mode entry.

Figure 319. Delayed burst mode entry with deadtime enabled and IDLESx = 1

The delayed burst entry mode is enabled with DIDLx bit in the HRTIM_OUTxR register (one enable bit per output). It forces a deadtime insertion before the output takes its idle state. Each TIMx output has its own deadtime value:

• – DTRx[8:0] on output 1 when DIDL1 = 1
• – DTFx[8:0] on output 2 when DIDL2 = 1

DIDLx bits can be set only if one of the outputs has an active idle level during the burst mode (IDLES = 1) and only when positive deadtimes are used (SDTR/SDTF set to 0).

Note: The delayed burst entry mode uses deadtime generator resources. Consequently, when any of the 2 DIDLx bits is set and the corresponding timing unit uses the deadtime insertion (DTEN bit set in HRTIM_OUTxR), it is not possible to use the timerx output 2 as a filter for external events (Tx2 filtering signal is not available).

When durations defined by DTRx[8:0] and DTFx[8:0] are lower than 3 f _HRTIM clock cycle periods, the limitations related to the narrow pulse management listed in Section 37.3.6 must be applied.

When the burst mode entry arrives during the regular deadtime, it is aborted and a new deadtime is re-started corresponding to the inactive period, as on Figure 320 .

Figure 320. Delayed Burst mode entry during deadtime

Burst mode exit

The burst mode exit is either forced by software (in continuous mode) or once the idle period is elapsed (in single-shot mode). In both cases, the counter is re-started immediately (if it was hold in a reset state with MTBM or TxBM bit = 1), but the effective output state transition from the idle to active mode only happens after the programmed set/reset event.

A burst period interrupt is generated in single-shot and continuous modes when BMPERIE enable bit is set in the HRTIM_IER register. This interrupt can be used to synchronize the burst mode exit with a burst period in continuous burst mode.

Figure 321 shows how a normal operation is resumed when the deadtime is enabled. Although the burst mode exit is immediate, this is only effective on the first set event on any of the complementary outputs.

Two different cases are presented:

1. 1. The burst mode ends while the signal is inactive on the crossbar output waveform. The active state is resumed on Tx1 and Tx2 on the set event for the Tx1 output, and the Tx2 output does not take the complementary level on burst exit.
2. 2. The burst mode ends while the crossbar output waveform is active: the activity is resumed on the set event of Tx2 output, and Tx1 does not take the active level immediately on burst exit.

Figure 321. Burst mode exit when the deadtime generator is enabled

The behavior described above is slightly different when the push-pull mode is enabled. The push-pull mode forces an output reset at the beginning of the period if the output is inactive, or symmetrically forces an active level if the output was high during the preceding period.

Consequently, an output with an active idle state can be reset at the time the burst mode is exited even if no transition is explicitly programmed. For symmetrical reasons, an output can be set at the time the burst mode is exited even if no transition is explicitly programmed, in case it was active when it entered in idle state.

Burst mode registers preloading and update

BMPREN bit (Burst mode Preload Enable) allows to have the burst mode compare and period registers preloaded (HRTIM_BMCMP and HRTIM_BMPER).

When BMPREN is set, the transfer from preload to active register happens:

• • when the burst mode is enabled (BME = 1),
• • at the end of the burst mode period.

A write into the HRTIM_BMPER period register disables the update temporarily, until the HRTIM_BMCMP compare register is written, to ensure the consistency of the two registers when they are modified.

If the compare register only needs to be changed, a single write is necessary. If the period only needs to be changed, it is also necessary to re-write the compare to have the new values taken into account.

When BMPREN bits is reset, the write access into BMCMR and BMPER directly updates the active register. In this case, it is necessary to consider when the update is done during the overall burst period, for the 2 cases below:

a) Compare register update

If the new compare value is above the current burst mode counter value, the new compare is taken into account in the current period.

If the new compare value is below the current burst mode counter value, the new compare is taken into account in the next burst period in continuous mode, and ignored in single-shot mode (no compare match will occur and the idle state will last until the end of the idle period).

b) Period register update

If the new period value is above the current burst mode counter value, the change is taken into account in the current period.

Note: If the new period value is below the current burst mode counter value, the new period will not be taken into account, the burst mode counter will overflow (at 0xFFFF) and the change will be effective in the next period. In single-shot mode, the counter will roll over at 0xFFFF and the burst mode will re-start for another period up to the new programmed value.

Burst mode emulation using a compound register

The burst mode controller only controls one or a set of timers for a single converter. When the burst mode is necessary for multiple independent timers, it is possible to emulate a simple burst mode controller using the DMA and the HRTIM_CMP1CxR compound register, which holds aliases of both the repetition and the Compare 1 registers.

This is applicable to a converter which only requires a simple PWM (typically a buck converter), where the duty cycle only needs to be updated. In this case, the CMP1 register is used to reset the output (and define the duty cycle), while it is set on the period event.

In this case, a single 32-bit write access in CMP1CxR is sufficient to define the duty cycle (with the CMP1 value) and the number of periods during which this duty cycle is maintained (with the repetition value). To implement a burst mode, it is then only necessary to transfer by DMA (upon repetition event) two 32-bit data in continuous mode, organized as follows:

CMP1CxR = {REP_Run; CMP1 = Duty_Cycle}, {REP_Idle; CMP1 = 0}

For instance, the values:

{0x0003 0000}: CMP1 = 0 for 3 periods

{0x0001 0800}: CMP1 = 0x0800 for 1 period

will provide a burst mode with 2 periods active every 6 PWM periods, as shown on Figure 322 .

Figure 322. Burst mode emulation example

37.3.14 Chopper

A high-frequency carrier can be added on top of the timing unit output signals to drive isolation transformers. This is done in the output stage before the polarity insertion, as shown on Figure 323 , using CHP1 and CHP2 bits in the HRTIM_OUTxR register, to enable chopper on outputs 1 and 2, respectively.

Figure 323. Carrier frequency signal insertion

The chopper parameters can be adjusted using the HRIM_CHPxR register, with the possibility to define a specific pulsewidth at the beginning of the pulse, to be followed by a carrier frequency with programmable frequency and duty cycle, as in Figure 324 .

CARFRQ[3:0] bits define the frequency, ranging from 156 MHz to 25 MHz (for \( f_{HRTIM} = 400 \) MHz) following the formula \( F_{CHPFRQ} = f_{HRTIM} / (16 \times (CARFRQ[3:0]+1)) \) .

The duty cycle can be adjusted by 1/8 step with CARDTY[2:0], from 0/8 up to 7/8 duty cycle. When CARDTY[2:0] = 000 (duty cycle = 0/8), the output waveform only contains the starting pulse following the rising edge of the reference waveform, without any added carrier.

The pulsewidth of the initial pulse is defined using the STRPW[3:0] bitfield as follows: \( t_{1STPW} = (STRPW[3:0]+1) \times 16 \times t_{HRTIM} \) and ranges from 40 ns to 0.63 µs (for \( f_{HRTIM}=400 \) MHz).

The carrier frequency parameters are defined based on the \( f_{HRTIM} \) frequency, and are not dependent from the CKPSC[2:0] setting.

In chopper mode, the carrier frequency and the initial pulsewidth are combined with the reference waveform using an AND function. A synchronization is performed at the end of the initial pulse to have a repetitive signal shape.

The chopping signal is stopped at the end of the output waveform active state, without waiting for the current carrier period to be completed. It can thus contain shorter pulses than programmed.

Figure 324. HRTIM outputs with Chopper mode enabled

Note: CHP1 and CHP2 bits must be set prior to the output enable done with TxyOEN bits in the HRTIM_OENR register.

CARFRQ[2:0], CARDTY[2:0] and STRPW[3:0] bitfields cannot be modified while the chopper mode is active (at least one of the two CHPx bits is set).

37.3.15 Fault protection

The HRTIMER has a versatile fault protection circuitry to disable the outputs in case of an abnormal operation. Once a fault has been triggered, the outputs take a predefined safe state. This state is maintained until the output is re-enabled by software. In case of a permanent fault request, the output will remain in its fault state, even if the software attempts to re-enable them, until the fault source disappears.

The HRTIM has 5 FAULT input channels; all of them are available and can be combined for each of the 5 timing units, as shown on Figure 325 .

Figure 325. Fault protection circuitry (FAULT1 fully represented, FAULT2..5 partially)

Each fault channel is fully configurable using HRTIM_FLTINR1 and HRTIM_FLTINR2 registers before being routed to the timing units. FLTxSRC bit selects the source of the Fault signal, that can be either a digital input or an internal event (built-in comparator output).

Table 322 summarizes the available sources for each of the 10 faults channels:

Table 322. Fault inputs

The polarity of the signal can be selected to define the active level, using the FLTxP polarity bit in HRTIM_FLTINRx registers. If FLTxP = 0, the signal is active at low level; if FLTxP = 1, it is active when high.

The fault information can be filtered after the polarity setting. If FLTxF[3:0] bitfield is set to 0000, the signal is not filtered and will act asynchronously, independently from the \( f_{HRTIM} \) clock. For all other FLTxF[3:0] bitfield values, the signal is digitally filtered. The digital filter is made of a counter in which a number N of valid samples is needed to validate a transition on the output. If the input value changes before the counter has reached the value N, the counter is reset and the transition is discarded (considered as a spurious event). If the counter reaches N, the transition is considered as valid and transmitted as a correct external

event. Consequently, the digital filter adds a latency to the external events being filtered, depending on the sampling clock and on the filter length (number of valid samples expected). Figure 326 shows how a spurious fault signal is filtered.

The filtering period ranges from 2 cycles of the \( f_{\text{HRTIM}} \) clock up to 8 cycles of the \( f_{\text{FLTS}} \) clock divided by 32. \( f_{\text{FLTS}} \) is defined using FLTSD[1:0] bits in the HRTIM_FLTINR2 register.

Table 323 summarizes the sampling rate and the filter length. A jitter of 1 sampling clock period must be subtracted from the filter length to take into account the uncertainty due to the sampling and have the effective filtering.

Table 323. Sampling rate and filter length vs FLTxF[3:0] and clock setting

Table 323. Sampling rate and filter length vs FLTFxF[3:0] and clock setting (continued)

System fault input (hrtim_sys_flt)

This fault is provided by the MCU Class B circuitry (see the System configuration controller (SYSCFG) section for details) and corresponds to a system fault coming from:

• • the Clock Security System
• • the SRAM parity checker
• • the Cortex ^® -M7-lockup signal
• • the PVD detector

This input overrides the FAULT inputs and disables all outputs having FAULTy[1:0] = 01, 10, 11.

For each FAULT channel, a write-once FLTxLOCK bit in the HRTIM_FLTxR register allows to lock FLTxEN, FLTxP, FLTxSRC, FLTFxF[3:0] bits (it renders them read-only), for functional safety purpose. If enabled, the fault conditioning set-up is frozen until the next HRTIM or system reset.

Once the fault signal is conditioned as explained above, it is routed to the timing units. For any of them, the 5 fault channels are enabled using bits FLT1EN to FLT5EN in the HRTIM_FLTxR register, and they can be selected simultaneously (the sysfault is automatically enabled as long as the output is protected by the fault mechanism). This allows to have, for instance:

• • One fault channel simultaneously disabling several timing units
• • Multiple fault channels being ORed to disable a single timing unit

A write-once FLTLCK bit in the HRTIM_FLTxR register allows to lock FLTxEN bits (it renders them read-only) until the next reset, for functional safety purpose. If enabled, the timing unit fault-related set-up is frozen until the next HRTIM or system reset.

For each of the timers, the output state during a fault is defined with FAULT1[1:0] and FAULT2[1:0] bits in the HRTIM_OUTxR register (see Section 37.3.12 ).

37.3.16 Auxiliary outputs

Timer A to E have auxiliary outputs in parallel with the regular outputs going to the output stage. They provide the following internal status, events and signals:

• • SETxy and RSTxy status flags, together with the corresponding interrupts and DMA requests
• • Capture triggers upon output set/reset
• • External event filters following a Tx2 output copy (see details in Section 37.3.8 )

The auxiliary outputs are taken either before or after the burst mode controller, depending on the HRTIM operating mode. An overview is given on Figure 327 .

Figure 327. Auxiliary outputs

By default, the auxiliary outputs are copies of outputs Tx1 and Tx2. The exceptions are:

• • The delayed idle and the balanced idle protections, when the deadtime is disabled ( \( DTEN = 0 \) ). When the protection is triggered, the auxiliary outputs are maintained and follow the signal coming out of the crossbar. On the contrary, if the deadtime is enabled ( \( DTEN = 1 \) ), both main and auxiliary outputs are forced to an inactive level.
• • The burst mode ( \( TCEN=1 \) , \( IDLEMx=1 \) ); there are 2 cases:
  1. a) If \( DTEN=0 \) or \( DIDLx=0 \) , the auxiliary outputs are not affected by the burst mode entry and continue to follow the reference signal coming out of the crossbar (see Figure 328 ).
  2. b) If the deadtime is enabled ( \( DTEN=1 \) ) together with the delayed burst mode entry ( \( DIDLx=1 \) ), the auxiliary outputs have the same behavior as the main outputs. They are forced to the IDLES level after a deadtime duration, then they keep this level during all the burst period. When the burst mode is terminated, the IDLES level is maintained until a transition occurs to the opposite level, similarly to the main output.

Figure 328. Auxiliary and main outputs during burst mode (DIDLx = 0)

The signal on the auxiliary output can be slightly distorted when exiting from the burst mode or when re-enabling the outputs after a delayed protection, if this happens during a deadtime. In this case, the deadtime applied to the auxiliary outputs is extended so that the deadtime on the main outputs is respected. Figure 329 gives some examples.

Figure 329. Deadtime distortion on auxiliary output when exiting burst mode

37.3.17 Synchronizing the HRTIM with other timers or HRTIM instances

The HRTIM provides options for synchronizing multiple HRTIM instances, as a master unit (generating a synchronization signal) or as a slave (waiting for a trigger to be synchronized). This feature can also be used to synchronize the HRTIM with other timers, either external or on-chip. The synchronization circuitry is controlled inside the master timer.

Synchronization output

This section explains how the HRTIM must be configured to synchronize external resources and act as a master unit.

Four events can be selected as the source to be sent to the synchronization output. This is done using SYNCSRC[1:0] bits in the HRTIM_MCR register, as follows:

• • 00: Master timer Start
  This event is generated when MCEN bit is set or when the timer is re-started after having reached the period value in single-shot mode. It is also generated on a reset which occurs during the counting (when CONT or RETRIG bits are set).
• • 01: Master timer Compare 1 event
• • 10: Timer A start
  This event is generated when TACEN bit is set or when the counter is reset and restarts counting in response to this reset. The following counter reset events are not propagated to the synchronization output: counter roll-over in continuous mode, and discarded reset request in single-shot non-retriggerable mode. The reset is only taken into account when it occurs during the counting (CONT or RETRIG bits are set).
• • 11: Timer A Compare 1 event

SYNCOUT[1:0] bits in the HRTIM_MCR register specify how the synchronization event is generated.

The synchronization pulses are generated on the HRTIM_SCOUT output pin, with SYNCOUT[1:0] = 1x. SYNCOUT[0] bit specifies the polarity of the synchronization signal. If SYNCOUT[0] = 0, the HRTIM_SCOUT pin has a low idle level and issues a positive pulse of \( 16 f_{\text{HRTIM}} \) clock cycles length for the synchronization). If SYNCOUT[0] = 1, the idle level is high and a negative pulse is generated.

Note: The synchronization pulse is followed by an idle level of \( 16 f_{\text{HRTIM}} \) clock cycles during which any new synchronization request is discarded. Consequently, the maximum synchronization frequency is \( f_{\text{HRTIM}}/32 \) .

The idle level on the HRTIM_SCOUT pin is applied as soon as the SYNCOUT[1:0] bits are enabled (i.e. the bitfield value is different from 00).

The synchronization output initialization procedure must be done prior to the configuration of the MCU outputs and counter enable, in the following order:

1. 1. SYNCOUT[1:0] and SYNCSRC[1:0] bitfield configuration in HRTIM_MCR
2. 2. HRTIM_SCOUT pin configuration (see the General-purpose I/Os section)
3. 3. Master or Timer A counter enable (MCEN or TACEN bit set)

When the synchronization input mode is enabled and starts the counter (using SYNCSTRM/SYNCSTRTx bits) simultaneously with the synchronization output mode (SYNCSRC[1:0] = 00 or 10), the output pulse is generated only when the counter is starting or is reset while running. Any reset request clearing the counter without causing it to start will not affect the synchronization output.

Synchronization input

The HRTIM can be synchronized by external sources, as per the programming of the SYNCIN[1:0] bits in the HRTIM_MCR register:

• • 00: synchronization input is disabled
• • 01: reserved configuration
• • 10: the on-chip TIM1 general purpose timer (TIM1 TRGO output)
• • 11: a positive pulse on the HRTIM_SCIN input pin

This bitfield cannot be changed once the destination timer (master timer or timing unit) is enabled (MCEN and/or TxCEN bit set).

The HRTIM_SCIN input is rising-edge sensitive. The timer behavior is defined with the following bits present in HRTIM_MCR and HRTIM_TIMxCR registers (see Table 324 for details):

• • Synchronous start: the incoming signal starts the timer's counter (SYNCSTRM and/or SYNCSTRTx bits set). TxCEN (MCEN) bits must be set to have the timer enabled and the counter ready to start. In continuous mode, the counter will not start until the synchronization signal is received.
• • Synchronous reset: the incoming signal resets the counter (SYNCRSTM and/or SYNCRSTx bits set). This event decrements the repetition counter as any other reset event.

The synchronization events are taken into account only once the related counters are enabled (MCEN or TxCEN bit set). A synchronization request triggers a SYNC interrupt.

Note: A synchronized start event resets the counter if the current counter value is above the active period value.

The effect of the synchronization event depends on the timer operating mode, as summarized in Table 324 .

Table 324. Effect of sync event vs timer operating modes

Table 324. Effect of sync event vs timer operating modes (continued)

Figure 330 presents how the synchronized start is done in single-shot mode.

Figure 330. Counter behavior in synchronized start mode

37.3.18 ADC triggers

The ADCs can be triggered by the master and the 5 timing units.

4 independent triggers are available to start both the regular and the injected sequencers of the 2 ADCs. Up to 32 events can be combined (ORed) for each trigger output, in registers HRTIM_ADC1R to HRTIM_ADC4R, as shown on Figure 331 . Triggers 1/3 and 2/4 are using the same source set.

The external events can be used as a trigger. They are taken right after the conditioning defined in HRTIM_EECRx registers, and are not depending on EEFxR1 and EEFxR2 register settings.

Multiple triggering is possible within a single switching period by selecting several sources simultaneously. A typical use case is for a non-overlapping multiphase converter, where all phases can be sampled in a row using a single ADC trigger output.

Figure 331. ADC trigger selection overview

HRTIM_ADC1R to HRTIM_ADC4R registers are preloaded and can be updated synchronously with the timer they are related to. The update source is defined with ADxUSRC[2:0] bits in the HRTIM_CR1 register.

For instance, if ADC trigger 1 outputs Timer A CMP2 events (HRTIM_ADC1R = 0x0000 0400), HRTIM_ADC1R will be typically updated simultaneously with Timer A (AD1USRC[2:0] = 001).

When the preload is disabled (PREEN bit reset) in the source timer, the HRTIM_ADCxR registers are not preloaded either: a write access will result in an immediate update of the trigger source.

37.3.19 DAC triggers

The HRTIMER allows to have the embedded DACs updated synchronously with the timer updates.

The update events from the master timer and the timer units can generate DAC update triggers on any of the 3 hrtim_dac_trgx outputs.

Note: Each timer has its own DAC-related control register.

DACSYNC[1:0] bits of the HRTIM_MCR and HRTIM_TIMxCR registers are programmed as follows:

• • 00: No update generated
• • 01: Update generated on hrtim_dac_trg1
• • 10: Update generated on hrtim_dac_trg2
• • 11: Update generated on hrtim_dac_trg3

An output pulse of 1 \( f_{\text{HRTIM}} \) clock periods is generated on the hrtim_dac_trgx output.

When DACSYNC[1:0] bits are enabled in multiple timers, the hrtim_dac_trgx output will consist of an OR of all timers' update events. For instance, if DACSYNC = 1 in timer A and in timer B, the update event in timer A will be ORed with the update event in timer B to generate a DAC update trigger on the corresponding hrtim_dac_trgx output, as shown on Figure 332 .

Figure 332. Combining several updates on a single hrtim_dac_trgx output

hrtim_dac_trgx pins are connected to the DACs as follows:

• • hrtim_dac_trg1: DAC1_CH1 trigger input 9 (TSEL1[2:0] = 1001 in DAC_CR of DAC1 peripheral)
• • hrtim_dac_trg2: DAC1_CH2 trigger input 10 (TSEL1[2:0] = 1010 in DAC_CR of DAC1 peripheral)
• • hrtim_dac_trg3: not connected

37.3.20 HRTIM Interrupts

7 interrupts can be generated by the master timer:

• • Master timer registers update
• • Synchronization event received
• • Master timer repetition event
• • Master Compare 1 to 4 event

14 interrupts can be generated by each timing unit:

• • Delayed protection triggered
• • Counter reset or roll-over event
• • Output 1 and output 2 reset (transition active to inactive)
• • Output 1 and output 2 set (transition inactive to active)
• • Capture 1 and 2 events
• • Timing unit registers update
• • Repetition event
• • Compare 1 to 4 event

8 global interrupts are generated for the whole HRTIM:

• • System fault and Fault 1 to 5 (regardless of the timing unit attribution)
• • Burst mode period completed

The interrupt requests are grouped in 7 vectors as follows:

• • hrtim_mst_it: Master timer interrupts (Master Update, Sync Input, Repetition, MCMP1..4) and global interrupt except faults (Burst mode period)
• • hrtim_tima_it: TIMA interrupts
• • hrtim_timb_it: TIMB interrupts
• • hrtim_timc_it: TIMC interrupts
• • hrtim_timd_it: TIMD interrupts
• • hrtim_time_it: TIME interrupts
• • hrtim_fault_it: Dedicated vector all fault interrupts to allow high-priority interrupt handling

Table 325 is a summary of the interrupt requests, their mapping and associated control, and status bits.

Table 325. HRTIM interrupt summary

37.3.21 DMA

Most of the events able to generate an interrupt can also generate a DMA request, even both simultaneously. Each timer (master, TIMA...E) has its own DMA enable register.

The individual DMA requests are ORed into 6 channels as follows:

• • 1 channel for the master timer
• • 1 channel per timing unit

Note: Before disabling a DMA channel (DMA enable bit reset in TIMxDIER), it is necessary to disable first the DMA controller.

Table 326 is a summary of the events with their associated DMA enable bits.

Table 326. HRTIM DMA request summary

Burst DMA transfers

In addition to the standard DMA requests, the HRTIM features a DMA burst controller to have multiple registers updated with a single DMA request. This allows to:

• • update multiple data registers with one DMA channel only,
• • reprogram dynamically one or several timing units, for converters using multiple timer outputs.

The burst DMA feature is only available for one DMA channel, but any of the 6 channels can be selected for burst DMA transfers.

The principle is to program which registers are to be written by DMA. The master timer and TIMA..E have the burst DMA update register, where most of their control and data registers are associated with a selection bit: HRTIM_BDMUPR, HRTIM_BDTAUPR to HRTIM_BDTUUPR (this is applicable only for registers with write accesses). A redirection mechanism allows to forward the DMA write accesses to the HRTIM registers automatically, as shown on Figure 333 .

Figure 333. DMA burst overview

When the DMA trigger occurs, the HRTIM generates multiple 32-bit DMA requests and parses the update register. If the control bit is set, the write access is redirected to the associated register. If the bit is reset, the register update is skipped and the register parsing is resumed until a new bit set is detected, to trigger a new request. Once the 6 update registers (HRTIM_BDMUPR, 5x HRTIM_BDTxUPR) are parsed, the burst is completed and the system is ready for another DMA trigger (see the flowchart on Figure 334 ).

Note: Any trigger occurring while the burst is on-going is discarded, except if it occurs during the very last data transfer.

The burst DMA mode is permanently enabled (there is no enable bit). A burst DMA operation is started by the first write access into the HRTIM_BDMADR register.

It is only necessary to have the DMA controller pointing to the HRTIM_BDMADR register as the destination, in the memory, to the peripheral configuration with the peripheral increment mode disabled (the HRTIM handles internally the data re-routing to the final destination register).

To re-initialize the burst DMA mode if it was interrupted during a transaction, it is necessary to write at least to one of the 6 update registers.

Figure 334. Burst DMA operation flowchart

    graph TD
        Start([Write access to HRTIM_BDMADR]) --> P1[Parse HRTIM_BDMUPR]
        
        subgraph Master_Timer_Parsing
        P1 --> D1{MCR bit set?}
        D1 -- Yes --> W1[Write data into HRTIM_MCR]
        D1 -- No --> D2{MCIR bit set?}
        W1 --> D2
        D2 -- Yes --> W2[Write data into HRTIM_MICR]
        D2 -- No --> D3{MCMP4 bit set?}
        W2 --> D3
        D3 -- Yes --> W3[Write data into HRTIM_MCMP4]
        D3 -- No --> P2[Parse HRTIM_BDTAUPR]
        W3 --> P2
        end

        subgraph Timer_A_Parsing
        P2 --> D4{TIMACR bit set?}
        D4 -- Yes --> W4[Write data into HRTIM_TIMACR]
        D4 -- No --> D5{TIMAICR bit set?}
        W4 --> D5
        D5 -- Yes --> W5[Write data into HRTIM_TIMAICR]
        D5 -- No --> D6{TIMAFLTR bit set?}
        W5 --> D6
        D6 -- Yes --> W6[Write data into HRTIM_FLTAR]
        D6 -- No --> P3[Parse HRTIM_BDTEUPR]
        W6 --> P3
        end

        subgraph Timer_E_Parsing
        P3 --> D7{TIMECR bit set?}
        D7 -- Yes --> W7[Write data into HRTIM_TIMECR]
        D7 -- No --> D8{TIMEICR bit set?}
        W7 --> D8
        D8 -- Yes --> W8[Write data into HRTIM_TIMEICR]
        D8 -- No --> D9{TIMEFLTR bit set?}
        W8 --> D9
        D9 -- Yes --> W9[Write data into HRTIM_FLTER]
        D9 -- No --> End([End of DMA burst])
        W9 --> End
        end
    

MS32341V1

Several options are available once the DMA burst is completed, depending on the register update strategy.

If the PREEN bit is reset (preload disabled), the value written by the DMA is immediately transferred into the active register and the registers are updated sequentially, following the DMA transaction pace.

When the preload is enabled (PREEN bit set), there are 3 use cases:

1. 1. The update is done independently from DMA burst transfers (UPDGAT[3:0] = 0000 in HRTIM_TIMxCR and BRSTDMA[1:0] = 00 in HRTIM_MCR). In this case, and if it is necessary to have all transferred data taken into account simultaneously, the user must check that the DMA burst is completed before the update event takes place. On the contrary, if the update event happens while the DMA transfer is on-going, only part of the registers will be loaded and the complete register update will require 2 consecutive update events.
2. 2. The update is done when the DMA burst transfer is completed (UPDGAT[3:0] = 0000 in HRTIM_TIMxCR and BRSTDMA[1:0] = 01 in HRTIM_MCR). This mode guarantees that all new register values are transferred simultaneously. This is done independently

from the counter value and can be combined with regular update events, if necessary (for instance, an update on a counter reset when TxRSTU is set).

1. 3. The update is done on the update event following the DMA burst transfer completion (UPDGAT[3:0] = 0010 in HRTIM_TIMxCR and BRSTDMA[1:0] = 10 in HRTIM_MCR). This mode guarantees both a coherent update of all transferred data and the synchronization with regular update events, with the timer counter. In this case, if a regular update request occurs while the transfer is on-going, it will be discarded and the effective update will happen on the next coming update request.

The chronogram on Figure 335 presents the active register content for 3 cases: PREEN=0, UPDGAT[3:0] = 0001 and UPDGAT[3:0] = 0001 (when PREEN = 1).

Figure 335. Registers update following DMA burst transfer

37.3.22 HRTIM initialization

This section describes the recommended HRTIM initialization procedure, including other related MCU peripherals.

The HRTIM clock source must be enabled in the Reset and Clock control unit (RCC).

The HRTIM control registers can be initialized as per the power converter topology and the timing units use case. All inputs have to be configured (source, polarity, edge-sensitivity).

The HRTIM outputs must be set up eventually, with the following sequence:

• • the polarity must be defined using POLx bits in HRTIM_OUTxR
• • the FAULT and IDLE states must be configured using FAULTx[1:0] and IDLESx bits in HRTIM_OUTxR

The HRTIM outputs are ready to be connected to the MCU I/Os. In the GPIO controller, the selected HRTIM I/Os have to be configured as per the alternate function mapping table in the product datasheet.

From this point on, the HRTIM controls the outputs, which are in the IDLE state.

The outputs are configured in RUN mode by setting TxyOEN bits in the HRTIM_OENR register. The 2 outputs are in the inactive state until the first valid set/reset event in RUN mode. Any output set/reset event (except software requests using SST, SRT) are ignored as long as TxCEN bit is reset, as well as burst mode requests (IDLEM bit value is ignored). Similarly, any counter reset request coming from the burst mode controller is ignored (if TxBM bit is set).

Note: When the deadtime insertion is enabled (DTEN bit set), it is necessary to force the output state by software, using SST and RST bits, to have the outputs in a complementary state as soon as the RUN mode is entered.

The HRTIM operation can eventually be started by setting TxCEN or MCEN bits in HRTIM_MCR.

If the HRTIM peripheral is reset with the Reset and Clock Controller, the HRTIM outputs are put in IDLE mode with a low level. It is recommended to first disconnect the HRTIMER from the outputs (using the GPIO controller) before performing a peripheral reset.

37.3.23 Debug

When a microcontroller enters the debug mode (Cortex ^® -M7 core halted), the TIMx counter either continues to work normally or stops, depending on DBG_HRTIM_STOP configuration bit in DBG module:

• • DBG_HRTIM_STOP = 0: no behavior change, the HRTIM continues to operate.
• • DBG_HRTIM_STOP = 1: all HRTIM timers, including the master, are stopped. The outputs in RUN mode enter the FAULT state if FAULTx[1:0] = 01,10,11, or keep their current state if FAULTx[1:0] = 00. The outputs in idle state are maintained in this state. This is permanently maintained even if the MCU exits the halt mode. This allows to maintain a safe state during the execution stopping. The outputs can be enabled again by settings TxyOEN bit (requires the use of the debugger).

Timer behavior during MCU halt when DBG_HRTIM_STOP = 1

The set/reset crossbar, the dead-time and push-pull unit, the idle/balanced fault detection and all the logic driving the normal output in RUN mode are not affected by debug. The output will keep on toggling internally, so as to retrieve regular signals of the outputs when TxyOEN will be set again (during or after the MCU halt). Associated triggers and filters are also following internal waveforms when the outputs are disabled.

FAULT inputs and events (any source) are enabled during the MCU halt.

Fault status bits can be set and TxyOEN bits reset during the MCU halt if a fault occurs at that time (TxyOEN and TxyODS are not affected by DBG_HRTIM_STOP bit state).

Synchronization, counter reset, start and reset-start events are discarded in debug mode, as well as capture events. This is to keep all related registers stable as long as the MCU is halted.

The counter stops counting when a breakpoint is reached. However, the counter enable signal is not reset; consequently no start event will be emitted when exiting from debug. All counter reset and capture triggers are disabled, as well as external events (ignored as long as the MCU is halted). The outputs SET and RST flags are frozen, except in case of forced software set/reset. A level-sensitive event is masked during the debug but will be active again as soon as the debug will be exited. For edge-sensitive events, if the signal is maintained active during the MCU halt, a new edge is not generated when exiting from debug.

The update events are discarded. This prevents any update trigger on hrtim_upd_en[3:1] inputs. DMA triggers are disabled. The burst mode circuit is frozen: the triggers are ignored and the burst mode counter stopped.

37.4 Application use cases

37.4.1 Buck converter

Buck converters are of common use as step-down converters. The HRTIM can control up to 10 buck converters with 6 independent switching frequencies.

The converter usually operates at a fixed frequency and the \( V_{in}/V_{out} \) ratio depends on the duty cycle \( D \) applied to the power switch:

The topology is given on Figure 336 with the connection to the ADC for voltage reading.

Figure 336. Buck converter topology

Figure 337 presents the management of two converters with identical frequency PWM signals. The outputs are defined as follows:

• • HRTIM_CHA1 set on period, reset on CMP1
• • HRTIM_CHA2 set on CMP3, reset on PER

The ADC is triggered twice per period, precisely in the middle of the ON time, using CMP2 and CMP4 events.

Figure 337. Dual Buck converter management

Timers A..E provide either 10 buck converters coupled by pairs (both with identical switching frequencies) or 6 completely independent converters (each of them having a different switching frequency), using the master timer as the 6 ^th time base.

37.4.2 Buck converter with synchronous rectification

Synchronous rectification allows to minimize losses in buck converters, by means of a FET replacing the freewheeling diode. Synchronous rectification can be turned on or off on the fly depending on the output current level, as shown on Figure 338.

Figure 338. Synchronous rectification depending on output current

The main difference vs. a single-switch buck converter is the addition of a deadtime for an almost complementary waveform generation on HRTIM_CHA2, based on the reference waveform on HRTIM_CHA1 (see Figure 339).

Figure 339. Buck with synchronous rectification

37.4.3 Multiphase converters

Multiphase techniques can be applied to multiple power conversion topologies (buck, flyback). Their main benefits are:

• • Reduction of the current ripple on the input and output capacitors
• • Reduced EMI
• • Higher efficiency at light load by dynamically changing the number of phases (phase shedding)

The HRTIM is able to manage multiple converters. The number of converters that can be controlled depends on the topologies and resources used (including the ADC triggers):

• • 5 buck converters with synchronous rectification (SR), using the master timer and the 5 timers
• • 4 buck converters (without SR), using the master timer and 2 timers
• • ...

Figure 341 presents the topology of a 3-phase interleaved buck converter.

Figure 340. 3-phase interleaved buck converter

The master timer is responsible for the phase management: it defines the phase relationship between the converters by resetting the timers periodically. The phase-shift is \( 360^\circ \) divided by the number of phases, \( 120^\circ \) in the given example.

The duty cycle is then programmed into each of the timers. The outputs are defined as follows:

• • HRTIM_CHA1 set on master timer period, reset on TACMP1
• • HRTIM_CHB1 set on master timer MCMP1, reset on TBCMP1
• • HRTIM_CHC1 set on master timer MCMP2, reset on TCCMP1

The ADC trigger can be generated on TxCMP2 compare event. Since all ADC trigger sources are phase-shifted because of the converter topology, it is possible to have all of them combined into a single ADC trigger to save ADC resources (for instance 1 ADC regular channel for the full multi-phase converter).

Figure 341. 3-phase interleaved buck converter control

37.4.4 Transition mode Power Factor Correction

The basic operating principle is to build up current into an inductor during a fixed \( T_{on} \) time. This current will then decay during the \( T_{off} \) time, and the period will be re-started when it becomes null. This is detected using a Zero Crossing Detection circuitry (ZCD), as shown on Figure 342. With a constant \( T_{on} \) time, the peak current value in the inductor is proportional to the rectified AC input voltage, which provides the power factor correction.

Figure 342. Transition mode PFC

This converter is operating with a constant \( T_{on} \) time and a variable frequency due the \( T_{off} \) time variation (depending on the input voltage). It must also include some features to operate when no zero-crossing is detected, or to limit the \( T_{on} \) time in case of over-current (OC). The OC feedback is usually conditioned with the built-in comparator and routed onto an external event input.

Figure 343 presents the waveform during the various operating modes, with the following parameters defined:

• • \( T_{on} \) Min: masks spurious overcurrent (freewheeling diode recovery current), represented as OC blanking
• • \( T_{on} \) Max: practically, the converter set-point. It is defined by CMP1
• • \( T_{off} \) Min: limits the frequency when the current limit is close to zero (demagnetization is very fast). It is defined with CMP2.
• • \( T_{off} \) Max: prevents the system to be stuck if no ZCD occurs. It is defined with CMP4 in auto-delayed mode.

Both \( T_{off} \) values are auto-delayed since the value must be relative to the output falling edge.

Figure 343. Transition mode PFC waveforms

MS32350V2

37.5 HRTIM registers

37.5.1 HRTIM Master Timer Control Register (HRTIM_MCR)

Address offset: 0x0000h

Reset value: 0x0000 0000

Bits 31:30 BRSTDMA[1:0]: Burst DMA Update

These bits define how the update occurs relatively to a burst DMA transaction.

• 00: Update done independently from the DMA burst transfer completion
• 01: Update done when the DMA burst transfer is completed
• 10: Update done on master timer roll-over following a DMA burst transfer completion. This mode only works in continuous mode.
• 11: reserved

Bit 29 MREPU: Master Timer Repetition update

This bit defines whether an update occurs when the master timer repetition period is completed (either due to roll-over or reset events). MREPU can be set only if BRSTDMA[1:0] = 00 or 01.

• 0: Update on repetition disabled
• 1: Update on repetition enabled

Bit 28 Reserved, must be kept at reset value.

Bit 27 PREEN: Preload enable

This bit enables the registers preload mechanism and defines whether the write accesses to the memory mapped registers are done into HRTIM active or preload registers.

• 0: Preload disabled: the write access is directly done into the active register
• 1: Preload enabled: the write access is done into the preload register

Bits 26:25 DACSYNC[1:0] DAC Synchronization

A DAC synchronization event can be enabled and generated when the master timer update occurs.

These bits are defining on which output the DAC synchronization is sent (refer to Section 37.3.19: DAC triggers for connections details).

• 00: No DAC trigger generated
• 01: Trigger generated on hrtim_dac_trg1
• 10: Trigger generated on hrtim_dac_trg2
• 11: Trigger generated on hrtim_dac_trg3

Bits 24:22 Reserved, must be kept at reset value.

Bit 21 TECEN: Timer E counter enable

This bit starts the Timer E counter.

• 0: Timer E counter disabled
• 1: Timer E counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of f _HRTIM clock.

This bit starts the Timer D counter.

0: Timer D counter disabled

1: Timer D counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of \( f_{HRTIM} \) clock.

This bit starts the Timer C counter.

0: Timer C counter disabled

1: Timer C counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of \( f_{HRTIM} \) clock.

This bit starts the Timer B counter.

0: Timer B counter disabled

1: Timer B counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of \( f_{HRTIM} \) clock.

This bit starts the Timer A counter.

0: Timer A counter disabled

1: Timer A counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of \( f_{HRTIM} \) clock.

This bit starts the Master timer counter.

0: Master counter disabled

1: Master counter enabled

Note: This bit must not be changed within a minimum of 8 cycles of \( f_{HRTIM} \) clock.

These bits define the source and event to be sent on the synchronization outputs SYNCOUT[2:1]

00: Master timer Start

01: Master timer Compare 1 event

10: Timer A start/reset

11: Timer A Compare 1 event

These bits define the routing and conditioning of the synchronization output event.

00: disabled

01: Reserved.

10: Positive pulse on HRTIM_SCOUT output (16x \( f_{HRTIM} \) clock cycles)

11: Negative pulse on HRTIM_SCOUT output (16x \( f_{HRTIM} \) clock cycles)

Note: This bitfield must not be modified once the counter is enabled (TxCEN bit set)

This bit enables the Master timer start when receiving a synchronization input event:

0: No effect on the Master timer

1: A synchronization input event starts the Master timer

This bit enables the Master timer reset when receiving a synchronization input event:

0: No effect on the Master timer

1: A synchronization input event resets the Master timer

These bits are defining the synchronization input source.

00: disabled. HRTIM is not synchronized and runs in standalone mode.

01: Reserved.

10: Internal event: the HRTIM is synchronized with the on-chip timer (see Synchronization input ).

11: External event (input pin). A positive pulse on HRTIM_SCIN input triggers the HRTIM.

Note: This parameter cannot be changed once the impacted timers are enabled.

Bits 7:6 Reserved, must be kept at reset value.

This bit enables the half duty-cycle mode: the HRTIM_MCMP1xR active register is automatically updated with HRTIM_MPER/2 value when HRTIM_MPER register is written.

0: Half mode disabled

1: Half mode enabled

This bit defines the behavior of the master timer counter in single-shot mode.

0: The timer is not re-triggerable: a counter reset can be done only if the counter is stopped (period elapsed)

1: The timer is re-triggerable: a counter reset is done whatever the counter state (running or stopped)

0: The timer operates in single-shot mode and stops when it reaches the MPER value

1: The timer operates in continuous (free-running) mode and rolls over to zero when it reaches the MPER value

These bits define the master timer clock prescaler ratio.

The counter clock equivalent frequency ( \( f_{COUNTER} \) ) is equal to \( f_{HRCK} / 2^{(CKPSC[2:0]-5)} \) .

The prescaling ratio cannot be modified once the timer is enabled.

000: Reserved

001: Reserved

010: Reserved

011: Reserved

100: Reserved

101: \( f_{COUNTER} = f_{HRTIM} \)

110: \( f_{COUNTER} = f_{HRTIM} / 2 \)

111: \( f_{COUNTER} = f_{HRTIM} / 4 \)

37.5.2 HRTIM Master Timer Interrupt Status Register (HRTIM_MISR)

Address offset: 0x0004h

Reset value: 0x0000 0000

Bits 31:7 Reserved, must be kept at reset value.

Bit 6 MUPD : Master Update Interrupt Flag

This bit is set by hardware when the Master timer registers are updated.

0: No Master Update interrupt occurred

1: Master Update interrupt occurred

Bit 5 SYNC : Sync Input Interrupt Flag

This bit is set by hardware when a synchronization input event is received.

0: No Sync input interrupt occurred

1: Sync input interrupt occurred

Bit 4 MREP : Master Repetition Interrupt Flag

This bit is set by hardware when the Master timer repetition period has elapsed.

0: No Master Repetition interrupt occurred

1: Master Repetition interrupt occurred

Bit 3 MCMP4 : Master Compare 4 Interrupt Flag

Refer to MCMP1 description

Bit 2 MCMP3 : Master Compare 3 Interrupt Flag

Refer to MCMP1 description

Bit 1 MCMP2 : Master Compare 2 Interrupt Flag

Refer to MCMP1 description

Bit 0 MCMP1 : Master Compare 1 Interrupt Flag

This bit is set by hardware when the Master timer counter matches the value programmed in the master Compare 1 register.

0: No Master Compare 1 interrupt occurred

1: Master Compare 1 interrupt occurred

37.5.3 HRTIM Master Timer Interrupt Clear Register (HRTIM_MICR)

Address offset: 0x0008h

Reset value: 0x0000 0000

Bits 31:7 Reserved, must be kept at reset value.

Bit 6 MUPDC : Master update Interrupt flag clear

Writing 1 to this bit clears the MUPDC flag in HRTIM_MISR register

Bit 5 SYNCC : Sync Input Interrupt flag clear

Writing 1 to this bit clears the SYNC flag in HRTIM_MISR register

Bit 4 MREPC : Repetition Interrupt flag clear

Writing 1 to this bit clears the MREP flag in HRTIM_MISR register

Bit 3 MCMP4C : Master Compare 4 Interrupt flag clear

Writing 1 to this bit clears the MCMP4 flag in HRTIM_MISR register

Bit 2 MCMP3C : Master Compare 3 Interrupt flag clear

Writing 1 to this bit clears the MCMP3 flag in HRTIM_MISR register

Bit 1 MCMP2C : Master Compare 2 Interrupt flag clear

Writing 1 to this bit clears the MCMP2 flag in HRTIM_MISR register

Bit 0 MCMP1C : Master Compare 1 Interrupt flag clear

Writing 1 to this bit clears the MCMP1 flag in HRTIM_MISR register

37.5.4 HRTIM Master Timer DMA / Interrupt Enable Register (HRTIM_MDIER)

Address offset: 0x000Ch

Reset value: 0x0000 0000

Bits 31:23 Reserved, must be kept at reset value.

Bit 22 MUPDDE : Master Update DMA request Enable

This bit is set and cleared by software to enable/disable the Master update DMA requests.

0: Master update DMA request disabled

1: Master update DMA request enabled

Bit 21 SYNCDE : Sync Input DMA request Enable

This bit is set and cleared by software to enable/disable the Sync input DMA requests.

0: Sync input DMA request disabled

1: Sync input DMA request enabled

Bit 20 MREPDE : Master Repetition DMA request Enable

This bit is set and cleared by software to enable/disable the Master timer repetition DMA requests.

0: Repetition DMA request disabled

1: Repetition DMA request enabled

Bit 19 MCMP4DE : Master Compare 4 DMA request Enable

Refer to MCMP1DE description

Bit 18 MCMP3DE : Master Compare 3 DMA request Enable

Refer to MCMP1DE description

Bit 17 MCMP2DE : Master Compare 2 DMA request Enable

Refer to MCMP1DE description

Bit 16 MCMP1DE : Master Compare 1 DMA request Enable

This bit is set and cleared by software to enable/disable the Master timer Compare 1 DMA requests.

0: Compare 1 DMA request disabled

1: Compare 1 DMA request enabled

Bits 15:6 Reserved, must be kept at reset value.

Bit 6 MUPDIE : Master Update Interrupt Enable

This bit is set and cleared by software to enable/disable the Master timer registers update interrupts

0: Master update interrupts disabled

1: Master update interrupts enabled

This bit is set and cleared by software to enable/disable the Sync input interrupts

0: Sync input interrupts disabled

1: Sync input interrupts enabled

This bit is set and cleared by software to enable/disable the Master timer repetition interrupts

0: Master repetition interrupt disabled

1: Master repetition interrupt enabled

Refer to MCMP1IE description

Refer to MCMP1IE description

Refer to MCMP1IE description

This bit is set and cleared by software to enable/disable the Master timer Compare 1 interrupt

0: Compare 1 interrupt disabled

1: Compare 1 interrupt enabled

37.5.5 HRTIM Master Timer Counter Register (HRTIM_MCNTR)

Address offset: 0x0010h

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MCNT[15:0] : Counter value

Holds the master timer counter value. This register can only be written when the master timer is stopped (MCEN = 0 in HRTIM_MCR).

Note: The timer behavior is not guaranteed if the counter value is set above the HRTIM_MPER register value.

37.5.6 HRTIM Master Timer Period Register (HRTIM_MPER)

Address offset: 0x0014h

Reset value: 0x0000 FFDF

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MPER[15:0] : Master Timer Period value

This register defines the counter overflow value.

The period value must be above or equal to 3 periods of the \( f_{\text{HRTIM}} \) clock.

The maximum value is 0x0000 FFDF.

37.5.7 HRTIM Master Timer Repetition Register (HRTIM_MREP)

Address offset: 0x0018h

Reset value: 0x0000 0000

Bits 31:8 Reserved, must be kept at reset value.

Bits 7:0 MREP[7:0] : Master Timer Repetition period value

This register holds the repetition period value for the master counter. It is either the preload register or the active register if preload is disabled.

37.5.8 HRTIM Master Timer Compare 1 Register (HRTIM_MCMP1R)

Address offset: 0x001Ch

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MCMP1[15:0] : Master Timer Compare 1 value

This register holds the master timer Compare 1 value. It is either the preload register or the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

37.5.9 HRTIM Master Timer Compare 2 Register (HRTIM_MCMP2R)

Address offset: 0x0024h

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MCMP2[15:0] : Master Timer Compare 2 value

This register holds the master timer Compare 2 value. It is either the preload register or the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

37.5.10 HRTIM Master Timer Compare 3 Register (HRTIM_MCMP3R)

Address offset: 0x0028h

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MCMP3[15:0] : Master Timer Compare 3 value

This register holds the master timer Compare 3 value. It is either the preload register or the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

37.5.11 HRTIM Master Timer Compare 4 Register (HRTIM_MCMP4R)

Address offset: 0x002Ch

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 MCMP4[15:0] : Master Timer Compare 4 value

This register holds the master timer Compare 4 value. It is either the preload register or the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

37.5.12 HRTIM Timerx Control Register (HRTIM_TIMxCR)

Address offset: 0x0000h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:28 UPDGAT[3:0]: Update Gating

These bits define how the update occurs relatively to the burst DMA transaction and the external update request on update enable inputs 1 to 3 (see Table 314: Update enable inputs and sources ). The update events, as mentioned below, can be: MSTU, TEU, TDU, TCU, TBU, TAU, TxRSTU, TxREPU.

0000: the update occurs independently from the DMA burst transfer

0001: the update occurs when the DMA burst transfer is completed

0010: the update occurs on the update event following the DMA burst transfer completion

0011: the update occurs on a rising edge of HRTIM update enable input 1 (hrtim_upd_en1)

0100: the update occurs on a rising edge of HRTIM update enable input 2 (hrtim_upd_en2)

0101: the update occurs on a rising edge of HRTIM update enable input 3 (hrtim_upd_en3)

0110: the update occurs on the update event following a rising edge of HRTIM update enable input 1 (hrtim_upd_en1)

0111: the update occurs on the update event following a rising edge of HRTIM update enable input 2 (hrtim_upd_en2)

1000: the update occurs on the update event following a rising edge of HRTIM update enable input 3 (hrtim_upd_en3)

Other codes: reserved

Note: This bitfield must be reset before programming a new value.

For UPDGAT[3:0] values equal to 0001, 0011, 0100, 0101, it is possible to have multiple concurrent update source (for instance RSTU and DMA burst).

Bit 27 PREEN: Preload enable

This bit enables the registers preload mechanism and defines whether a write access into a preloadable register is done into the active or the preload register.

0: Preload disabled: the write access is directly done into the active register

1: Preload enabled: the write access is done into the preload register

Bits 26:25 DACSYNC[1:0]: DAC Synchronization

A DAC synchronization event is generated when the timer update occurs. These bits are defining on which output the DAC synchronization is sent (refer to Section 37.3.19: DAC triggers for connections details).

00: No DAC trigger generated

01: Trigger generated on hrtim_dac_trg1

10: Trigger generated on hrtim_dac_trg2

11: Trigger generated on hrtim_dac_trg3

Register update is triggered by the master timer update.

0: Update by master timer disabled

1: Update by master timer enabled

Bit 23 In HRTIM_TIMACR, HRTIM_TIMBCR, HRTIM_TIMCCR, HRTIM_TIMDCR:

Register update is triggered by the timer E update

0: Update by timer E disabled

1: Update by timer E enabled

In HRTIM_TIMECR:

Reserved, must be kept at reset value

Bit 22 In HRTIM_TIMACR, HRTIM_TIMBCR, HRTIM_TIMCCR, HRTIM_TIMECR:

Register update is triggered by the timer D update

0: Update by timer D disabled

1: Update by timer D enabled

In HRTIM_TIMDCR:

Reserved, must be kept at reset value

Bit 21 In HRTIM_TIMACR, HRTIM_TIMBCR, HRTIM_TIMDCR, HRTIM_TIMECR:

Register update is triggered by the timer C update

0: Update by timer C disabled

1: Update by timer C enabled

In HRTIM_TIMCCR:

Reserved, must be kept at reset value

Bit 20 In HRTIM_TIMACR, HRTIM_TIMCCR, HRTIM_TIMDCR, HRTIM_TIMECR:

Register update is triggered by the timer B update

0: Update by timer B disabled

1: Update by timer B enabled

In HRTIM_TIMBCR:

Reserved, must be kept at reset value

Bit 19 In HRTIM_TIMBCR, HRTIM_TIMCCR, HRTIM_TIMDCR, HRTIM_TIMECR:

Register update is triggered by the timer A update

0: Update by timer A disabled

1: Update by timer A enabled

In HRTIM_TIMACR:

Reserved, must be kept at reset value

Register update is triggered by Timerx counter reset or roll-over to 0 after reaching the period value in continuous mode.

0: Update by timer x reset / roll-over disabled

1: Update by timer x reset / roll-over enabled

Register update is triggered when the counter rolls over and HRTIM_REPx = 0

0: Update on repetition disabled

1: Update on repetition enabled

Bit 16 Reserved, must be kept at reset value.

This bitfield defines whether the compare register is behaving in standard mode (compare match issued as soon as counter equal compare), or in auto-delayed mode (see Auto-delayed mode ).

00: CMP4 register is always active (standard compare mode)

01: CMP4 value is recomputed and is active following a capture 2 event

10: CMP4 value is recomputed and is active following a capture 2 event, or is recomputed and active after Compare 1 match (timeout function if capture 2 event is missing)

11: CMP4 value is recomputed and is active following a capture event, or is recomputed and active after Compare 3 match (timeout function if capture event is missing)

Note: This bitfield must not be modified once the counter is enabled (TxCEN bit set)

This bitfield defines whether the compare register is behaving in standard mode (compare match issued as soon as counter equal compare), or in auto-delayed mode (see Auto-delayed mode ).

00: CMP2 register is always active (standard compare mode)

01: CMP2 value is recomputed and is active following a capture 1 event

10: CMP2 value is recomputed and is active following a capture 1 event, or is recomputed and active after Compare 1 match (timeout function if capture event is missing)

11: CMP2 value is recomputed and is active following a capture 1 event, or is recomputed and active after Compare 3 match (timeout function if capture event is missing)

Note: This bitfield must not be modified once the counter is enabled (TxCEN bit set)

This bit defines the Timer x behavior following the synchronization event:

0: No effect on Timer x

1: A synchronization input event starts the Timer x

This bit defines the Timer x behavior following the synchronization event:

0: No effect on Timer x

1: A synchronization input event resets the Timer x

Bits 9:7 Reserved, must be kept at reset value.

This bit enables the push-pull mode.

0: Push-Pull mode disabled

1: Push-Pull mode enabled

Note: This bitfield must not be modified once the counter is enabled (TxCEN bit set)

This bit enables the half duty-cycle mode: the HRTIM_CMP1xR active register is automatically updated with HRTIM_PERxR/2 value when HRTIM_PERxR register is written.

0: Half mode disabled

1: Half mode enabled

This bit defines the counter behavior in single shot mode.

0: The timer is not re-triggerable: a counter reset is done if the counter is stopped (period elapsed in single-shot mode or counter stopped in continuous mode)

1: The timer is re-triggerable: a counter reset is done whatever the counter state.

This bit defines the timer operating mode.

0: The timer operates in single-shot mode and stops when it reaches TIMxPER value

1: The timer operates in continuous mode and rolls over to zero when it reaches TIMxPER value

These bits define the master timer clock prescaler ratio.

The counter clock equivalent frequency ( \( f_{COUNTER} \) ) is equal to \( f_{HRCK} / 2^{(CKPSC[2:0]-5)} \) .

The prescaling ratio cannot be modified once the timer is enabled.

000: Reserved

001: Reserved

010: Reserved

011: Reserved

100: Reserved

101: \( f_{COUNTER} = f_{HRTIM} \)

110: \( f_{COUNTER} = f_{HRTIM} / 2 \)

111: \( f_{COUNTER} = f_{HRTIM} / 4 \)

37.5.13 HRTIM Timerx Interrupt Status Register (HRTIM_TIMxISR)

Address offset: 0x0004h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:22 Reserved, must be kept at reset value.

Bit 21 O2CPY: Output 2 Copy

This status bit is a raw copy of the output 2 state, before the output stage (chopper, polarity). It allows to check the current output state before re-enabling the output after a delayed protection.

0: Output 2 is inactive

1: Output 2 is active

Bit 20 O1CPY: Output 1 Copy

This status bit is a raw copy of the output 1 state, before the output stage (chopper, polarity). It allows to check the current output state before re-enabling the output after a delayed protection.

0: Output 1 is inactive

1: Output 1 is active

Bit 19 O2STAT: Output 2 Status

This status bit indicates the output 2 state when the delayed idle protection was triggered. This bit is updated upon any new delayed protection entry. This bit is not updated in balanced idle.

0: Output 2 was inactive

1: Output 2 was active

Bit 18 O1STAT: Output 1 Status

This status bit indicates the output 1 state when the delayed idle protection was triggered. This bit is updated upon any new delayed protection entry. This bit is not updated in balanced idle.

0: Output 1 was inactive

1: Output 1 was active

Bit 17 IPPSTAT: Idle Push Pull Status

This status bit indicates on which output the signal was applied, in push-pull mode balanced fault mode or delayed idle mode, when the protection was triggered (whatever the output state, active or inactive).

0: Protection occurred when the output 1 was active and output 2 forced inactive

1: Protection occurred when the output 2 was active and output 1 forced inactive

Bit 16 CPPSTAT: Current Push Pull Status

This status bit indicates on which output the signal is currently applied, in push-pull mode. It is only significant in this configuration.

0: Signal applied on output 1 and output 2 forced inactive

1: Signal applied on output 2 and output 1 forced inactive

Bit 15 Reserved

Bit 14 DLYPRT: Delayed Protection Flag

This bit indicates delayed idle or the balanced idle mode entry.

1. Bit 13 RST : Reset and/or roll-over Interrupt Flag
   This bit is set by hardware when the timer x counter is reset or rolls over in continuous mode.
   0: No TIMx counter reset/roll-over interrupt occurred
   1: TIMx counter reset/roll-over interrupt occurred
2. Bit 12 RSTx2 : Output 2 Reset Interrupt Flag
   Refer to RSTx1 description
3. Bit 11 SETx2 : Output 2 Set Interrupt Flag
   Refer to SETx1 description
4. Bit 10 RSTx1 : Output 1 Reset Interrupt Flag
   This bit is set by hardware when the Tx1 output is reset (goes from active to inactive mode).
   0: No Tx1 output reset interrupt occurred
   1: Tx1 output reset interrupt occurred
5. Bit 9 SETx1 : Output 1 Set Interrupt Flag
   This bit is set by hardware when the Tx1 output is set (goes from inactive to active mode).
   0: No Tx1 output set interrupt occurred
   1: Tx1 output set interrupt occurred
6. Bit 8 CPT2 : Capture2 Interrupt Flag
   Refer to CPT1 description
7. Bit 7 CPT1 : Capture1 Interrupt Flag
   This bit is set by hardware when the timer x capture 1 event occurs.
   0: No timer x Capture 1 reset interrupt occurred
   1: Timer x output 1 reset interrupt occurred
8. Bit 6 UPD : Update Interrupt Flag
   This bit is set by hardware when the timer x update event occurs.
   0: No timer x update interrupt occurred
   1: Timer x update interrupt occurred
9. Bit 5 Reserved, must be kept at reset value.
10. Bit 4 REP : Repetition Interrupt Flag
    This bit is set by hardware when the timer x repetition period has elapsed.
    0: No timer x repetition interrupt occurred
    1: Timer x repetition interrupt occurred
11. Bit 3 CMP4 : Compare 4 Interrupt Flag
    Refer to CMP1 description
12. Bit 2 CMP3 : Compare 3 Interrupt Flag
    Refer to CMP1 description
13. Bit 1 CMP2 : Compare 2 Interrupt Flag
    Refer to CMP1 description
14. Bit 0 CMP1 : Compare 1 Interrupt Flag
    This bit is set by hardware when the timer x counter matches the value programmed in the Compare 1 register.
    0: No Compare 1 interrupt occurred
    1: Compare 1 interrupt occurred

37.5.14 HRTIM Timerx Interrupt Clear Register (HRTIM_TIMxICR)

Address offset: 0x0008h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:15 Reserved, must be kept at reset value.

Bit 14 DLYPRTC : Delayed Protection Flag Clear

Writing 1 to this bit clears the DLYPRT flag in HRTIM_TIMxISR register

Bit 13 RSTC : Reset Interrupt flag Clear

Writing 1 to this bit clears the RST flag in HRTIM_TIMxISR register

Bit 12 RSTx2C : Output 2 Reset flag Clear

Writing 1 to this bit clears the RSTx2 flag in HRTIM_TIMxISR register

Bit 11 SETx2C : Output 2 Set flag Clear

Writing 1 to this bit clears the SETx2 flag in HRTIM_TIMxISR register

Bit 10 RSTx1C : Output 1 Reset flag Clear

Writing 1 to this bit clears the RSTx1 flag in HRTIM_TIMxISR register

Bit 9 SETx1C : Output 1 Set flag Clear

Writing 1 to this bit clears the SETx1 flag in HRTIM_TIMxISR register

Bit 8 CPT2C : Capture2 Interrupt flag Clear

Writing 1 to this bit clears the CPT2 flag in HRTIM_TIMxISR register

Bit 7 CPT1C : Capture1 Interrupt flag Clear

Writing 1 to this bit clears the CPT1 flag in HRTIM_TIMxISR register

Bit 6 UPDC : Update Interrupt flag Clear

Writing 1 to this bit clears the UPD flag in HRTIM_TIMxISR register

Bit 5 Reserved, must be kept at reset value.

Bit 4 REPC : Repetition Interrupt flag Clear

Writing 1 to this bit clears the REP flag in HRTIM_TIMxISR register

Bit 3 CMP4C : Compare 4 Interrupt flag Clear

Writing 1 to this bit clears the CMP4 flag in HRTIM_TIMxISR register

Bit 2 CMP3C : Compare 3 Interrupt flag Clear

Writing 1 to this bit clears the CMP3 flag in HRTIM_TIMxISR register

Bit 1 CMP2C : Compare 2 Interrupt flag Clear

Writing 1 to this bit clears the CMP2 flag in HRTIM_TIMxISR register

Bit 0 CMP1C : Compare 1 Interrupt flag Clear

Writing 1 to this bit clears the CMP1 flag in HRTIM_TIMxISR register

37.5.15 HRTIM Timerx DMA / Interrupt Enable Register (HRTIM_TIMxDIER)

Address offset: 0x000Ch (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bit 31 Reserved

Bit 30 DLYPRTDE : Delayed Protection DMA request Enable

This bit is set and cleared by software to enable/disable DMA requests on delayed protection.

0: Delayed protection DMA request disabled

1: Delayed protection DMA request enabled

Bit 29 RSTDE : Reset/roll-over DMA request Enable

This bit is set and cleared by software to enable/disable DMA requests on timer x counter reset or roll-over in continuous mode.

0: Timer x counter reset/roll-over DMA request disabled

1: Timer x counter reset/roll-over DMA request enabled

Bit 28 RSTx2DE : Output 2 Reset DMA request Enable

Refer to RSTx1DE description

Bit 27 SETx2DE : Output 2 Set DMA request Enable

Refer to SETx1DE description

Bit 26 RSTx1DE : Output 1 Reset DMA request Enable

This bit is set and cleared by software to enable/disable Tx1 output reset DMA requests.

0: Tx1 output reset DMA request disabled

1: Tx1 output reset DMA request enabled

Bit 25 SETx1DE : Output 1 Set DMA request Enable

This bit is set and cleared by software to enable/disable Tx1 output set DMA requests.

0: Tx1 output set DMA request disabled

1: Tx1 output set DMA request enabled

Bit 24 CPT2DE : Capture 2 DMA request Enable

Refer to CPT1DE description

Bit 23 CPT1DE : Capture 1 DMA request Enable

This bit is set and cleared by software to enable/disable Capture 1 DMA requests.

0: Capture 1 DMA request disabled

1: Capture 1 DMA request enabled

Bit 22 UPDDE : Update DMA request Enable

This bit is set and cleared by software to enable/disable DMA requests on update event.

0: Update DMA request disabled

1: Update DMA request enabled

1. Bit 21 Reserved, must be kept at reset value.
2. Bit 20 REPDE : Repetition DMA request Enable
   This bit is set and cleared by software to enable/disable DMA requests on repetition event.
   0: Repetition DMA request disabled
   1: Repetition DMA request enabled
3. Bit 19 CMP4DE : Compare 4 DMA request Enable
   Refer to CMP1DE description
4. Bit 18 CMP3DE : Compare 3 DMA request Enable
   Refer to CMP1DE description
5. Bit 17 CMP2DE : Compare 2 DMA request Enable
   Refer to CMP1DE description
6. Bit 16 CMP1DE : Compare 1 DMA request Enable
   This bit is set and cleared by software to enable/disable the Compare 1 DMA requests.
   0: Compare 1 DMA request disabled
   1: Compare 1 DMA request enabled
7. Bit 15 Reserved
8. Bit 14 DLYPRTIE : Delayed Protection Interrupt Enable
   This bit is set and cleared by software to enable/disable interrupts on delayed protection.
   0: Delayed protection interrupts disabled
   1: Delayed protection interrupts enabled
9. Bit 13 RSTIE : Reset/roll-over Interrupt Enable
   This bit is set and cleared by software to enable/disable interrupts on timer x counter reset or roll-over in continuous mode.
   0: Timer x counter reset/roll-over interrupt disabled
   1: Timer x counter reset/roll-over interrupt enabled
10. Bit 12 RSTx2IE : Output 2 Reset Interrupt Enable
    Refer to RSTx1IE description
11. Bit 11 SETx2IE : Output 2 Set Interrupt Enable
    Refer to SETx1IE description
12. Bit 10 RSTx1IE : Output 1 Reset Interrupt Enable
    This bit is set and cleared by software to enable/disable Tx1 output reset interrupts.
    0: Tx1 output reset interrupts disabled
    1: Tx1 output reset interrupts enabled
13. Bit 9 SETx1IE : Output 1 Set Interrupt Enable
    This bit is set and cleared by software to enable/disable Tx1 output set interrupts.
    0: Tx1 output set interrupts disabled
    1: Tx1 output set interrupts enabled
14. Bit 8 CPT2IE : Capture Interrupt Enable
    Refer to CPT1IE description
15. Bit 7 CPT1IE : Capture Interrupt Enable
    This bit is set and cleared by software to enable/disable Capture 1 interrupts.
    0: Capture 1 interrupts disabled
    1: Capture 1 interrupts enabled

This bit is set and cleared by software to enable/disable update event interrupts.

0: Update interrupts disabled

1: Update interrupts enabled

Bit 5 Reserved, must be kept at reset value.

This bit is set and cleared by software to enable/disable repetition event interrupts.

0: Repetition interrupts disabled

1: Repetition interrupts enabled

Refer to CMP1IE description

Refer to CMP1IE description

Refer to CMP1IE description

This bit is set and cleared by software to enable/disable the Compare 1 interrupts.

0: Compare 1 interrupt disabled

1: Compare 1 interrupt enabled

37.5.16 HRTIM Timerx Counter Register (HRTIM_CNTxR)

Address offset: 0x0010h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CNTx[15:0] : Timerx Counter value

This register holds the Timerx counter value. It can only be written when the timer is stopped (TxCEN = 0 in HRTIM_TIMxCR).

Note: The timer behavior is not guaranteed if the counter value is above the HRTIM_PERxR register value.

37.5.17 HRTIM Timerx Period Register (HRTIM_PERxR)

Address offset: 0x14h (this offset address is relative to timer x base address)

Reset value: 0x0000 FFDF

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 PERx[15:0] : Timerx Period value

This register holds timer x period value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

The period value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

The maximum value is 0x0000 FFDF.

37.5.18 HRTIM Timerx Repetition Register (HRTIM_REPxR)

Address offset: 0x18h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:8 Reserved, must be kept at reset value.

Bits 7:0 REP _x [7:0] : Timerx Repetition period value

This register holds the repetition period value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

37.5.19 HRTIM Timerx Compare 1 Register (HRTIM_CMP1xR)

Address offset: 0x1Ch (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CMP1 _x [15:0] : Timerx Compare 1 value

This register holds the compare 1 value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the f _HRTIM clock.

37.5.20 HRTIM Timerx Compare 1 Compound Register (HRTIM_CMP1CxR)

Address offset: 0x20h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:24 Reserved, must be kept at reset value.

Bits 23:16 REPx[7:0] : Timerx Repetition value (aliased from HRTIM_REPx register)

This bitfield is an alias from the REPx[7:0] bitfield in the HRTIMx_REPxR register.

Bits 15:0 CMP1x[15:0] : Timerx Compare 1 value

This bitfield is an alias from the CMP1x[15:0] bitfield in the HRTIMx_CMP1xR register.

37.5.21 HRTIM Timerx Compare 2 Register (HRTIM_CMP2xR)

Address offset: 0x24h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CMP2x[15:0] : Timerx Compare 2 value

This register holds the Compare 2 value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

This register can behave as an auto-delayed compare register, if enabled with DELCMP2[1:0] bits in HRTIM_TIMxCR.

37.5.22 HRTIM Timerx Compare 3 Register (HRTIM_CMP3xR)

Address offset: 0x28h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CMP3x[15:0] : Timerx Compare 3 value

This register holds the Compare 3 value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

37.5.23 HRTIM Timerx Compare 4 Register (HRTIM_CMP4xR)

Address offset: 0x2Ch (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CMP4x[15:0] : Timerx Compare 4 value

This register holds the Compare 4 value.

This register holds either the content of the preload register or the content of the active register if preload is disabled.

The compare value must be above or equal to 3 periods of the \( f_{HRTIM} \) clock.

This register can behave as an auto-delayed compare register, if enabled with DELCMP4[1:0] bits in HRTIM_TIMxCR.

37.5.24 HRTIM Timerx Capture 1 Register (HRTIM_CPT1xR)

Address offset: 0x30h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CPT1x[15:0] : Timerx Capture 1 value

This register holds the counter value when the capture 1 event occurred.

37.5.25 HRTIM Timerx Capture 2 Register (HRTIM_CPT2xR)

Address offset: 0x34h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:16 Reserved, must be kept at reset value.

Bits 15:0 CPT2x[15:0] : Timerx Capture 2 value

This register holds the counter value when the capture 2 event occurred.

37.5.26 HRTIM Timerx Deadtime Register (HRTIM_DTxR)

Address offset: 0x38h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bit 31 DTFLKx: Deadtime Falling Lock

This write-once bit prevents the deadtime (sign and value) to be modified, if enabled.
0: Deadtime falling value and sign is writable
1: Deadtime falling value and sign is read-only
Note: This bit is not preloaded

Bit 30 DTFSLKx: Deadtime Falling Sign Lock

This write-once bit prevents the sign of falling deadtime to be modified, if enabled.
0: Deadtime falling sign is writable
1: Deadtime falling sign is read-only
Note: This bit is not preloaded

Bits 29:26 Reserved, must be kept at reset value.

Bit 25 SDTFx: Sign Deadtime Falling value

This register determines whether the deadtime is positive (signals not overlapping) or negative (signals overlapping).
0: Positive deadtime on falling edge
1: Negative deadtime on falling edge

Bits 24:16 DTFx[8:0]: Deadtime Falling value

This register holds the value of the deadtime following a falling edge of reference PWM signal.

Bit 15 DTRLKx: Deadtime Rising Lock

This write-once bit prevents the deadtime (sign and value) to be modified, if enabled
0: Deadtime rising value and sign is writable
1: Deadtime rising value and sign is read-only
Note: This bit is not preloaded

Bit 14 DTRSLKx: Deadtime Rising Sign Lock

This write-once bit prevents the sign of deadtime to be modified, if enabled
0: Deadtime rising sign is writable
1: Deadtime rising sign is read-only
Note: This bit is not preloaded

Bit 13 Reserved, must be kept at reset value.

This register holds the value of the deadtime clock prescaler.

000: Reserved

001: Reserved

010: Reserved

011: \( t_{DTG} = t_{HRTIM} \)

100: \( t_{DTG} = t_{HRTIM} \times 2 \)

101: \( t_{DTG} = t_{HRTIM} \times 4 \)

110: \( t_{DTG} = t_{HRTIM} \times 8 \)

111: \( t_{DTG} = t_{HRTIM} \times 16 \)

This bitfield is read-only as soon as any of the lock bit is enabled (DTFLKs, DTFSLKx, DTRLKx, DTRSLKx).

This register determines whether the deadtime is positive or negative (overlapping signals)

0: Positive deadtime on rising edge

1: Negative deadtime on rising edge

This register holds the value of the deadtime following a rising edge of reference PWM signal.

37.5.27 HRTIM Timerx Output1 Set Register (HRTIM_SETx1R)

Address offset: 0x3Ch (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bit 31 UPDATE : Registers update (transfer preload to active)

Register update event forces the output to its active state.

Bit 30 EXTEVNT10 : External Event 10

Refer to EXTEVNT1 description

Bit 29 EXTEVNT9 : External Event 9

Refer to EXTEVNT1 description

Bit 28 EXTEVNT8 : External Event 8

Refer to EXTEVNT1 description

Bit 27 EXTEVNT7 : External Event 7

Refer to EXTEVNT1 description

Bit 26 EXTEVNT6 : External Event 6

Refer to EXTEVNT1 description

Bit 25 EXTEVNT5 : External Event 5

Refer to EXTEVNT1 description

Bit 24 EXTEVNT4 : External Event 4

Refer to EXTEVNT1 description

Bit 23 EXTEVNT3 : External Event 3

Refer to EXTEVNT1 description

Bit 22 EXTEVNT2 : External Event 2

Refer to EXTEVNT1 description

Bit 21 EXTEVNT1 : External Event 1

External event 1 forces the output to its active state.

Bit 20 TIMEVNT9 : Timer Event 9

Refer to TIMEVNT1 description

Bit 19 TIMEVNT8 : Timer Event 8

Refer to TIMEVNT1 description

Bit 18 TIMEVNT7 : Timer Event 7

Refer to TIMEVNT1 description

Bit 17 TIMEVNT6 : Timer Event 6

Refer to TIMEVNT1 description

1. Bit 16 TIMEVNT5 : Timer Event 5
   Refer to TIMEVNT1 description
2. Bit 15 TIMEVNT4 : Timer Event 4
   Refer to TIMEVNT1 description
3. Bit 14 TIMEVNT3 : Timer Event 3
   Refer to TIMEVNT1 description
4. Bit 13 TIMEVNT2 : Timer Event 2
   Refer to TIMEVNT1 description
5. Bit 12 TIMEVNT1 : Timer Event 1
   Timers event 1 forces the output to its active state (refer to Table 307 for Timer Events assignments)
6. Bit 11 MSTCMP4 : Master Compare 4
   Master Timer Compare 4 event forces the output to its active state.
7. Bit 10 MSTCMP3 : Master Compare 3
   Master Timer Compare 3 event forces the output to its active state.
8. Bit 9 MSTCMP2 : Master Compare 2
   Master Timer Compare 2 event forces the output to its active state.
9. Bit 8 MSTCMP1 : Master Compare 1
   Master Timer compare 1 event forces the output to its active state.
10. Bit 7 MSTPER : Master Period
    The master timer counter roll-over in continuous mode, or to the master timer reset in single-shot mode forces the output to its active state.
11. Bit 6 CMP4 : Timer x Compare 4
    Timer A compare 4 event forces the output to its active state.
12. Bit 5 CMP3 : Timer x Compare 3
    Timer A compare 3 event forces the output to its active state.
13. Bit 4 CMP2 : Timer x Compare 2
    Timer A compare 2 event forces the output to its active state.
14. Bit 3 CMP1 : Timer x Compare 1
    Timer A compare 1 event forces the output to its active state.
15. Bit 2 PER : Timer x Period
    Timer A Period event forces the output to its active state.
16. Bit 1 RESYNC : Timer A resynchronization
    Timer A reset event coming solely from software or SYNC input forces the output to its active state.
    Note: Other timer reset are not affecting the output when RESYNC=1
17. Bit 0 SST : Software Set trigger
    This bit forces the output to its active state. This bit can only be set by software and is reset by hardware.
    Note: This bit is not preloaded

37.5.28 HRTIM_Timerx Output1 Reset Register (HRTIM_RSTx1R)

Address offset: 0x40h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:0 Refer to HRTIM_SETx1R bits description.

These bits are defining the source which can force the Tx1 output to its inactive state.

37.5.29 HRTIM_Timerx Output2 Set Register (HRTIM_SETx2R)

Address offset: 0x44h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:0 Refer to HRTIM_SETx1R bits description.

These bits are defining the source which can force the Tx2 output to its active state.

37.5.30 HRTIM Timerx Output2 Reset Register (HRTIM_RSTx2R)

Address offset: 0x48h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:0 Refer to HRTIM_SETx1R bits description.

These bits are defining the source which can force the Tx2 output to its inactive state.

37.5.31 HRTIM Timerx External Event Filtering Register 1 (HRTIM_EEFxR1)

Address offset: 0x4Ch (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:29 Reserved, must be kept at reset value.

Bits 28:25 EE5FLTR[3:0] : External Event 5 filter
Refer to EE1FLTR[3:0] description

Bit 24 EE5LTCH : External Event 5 latch
Refer to EE1LTCH description

Bit 23 Reserved, must be kept at reset value.

Bits 22:19 EE4FLTR[3:0] : External Event 4 filter
Refer to EE1FLTR[3:0] description

Bit 18 EE4LTCH : External Event 4 latch
Refer to EE1LTCH description

Bit 17 Reserved, must be kept at reset value.

Bits 16:13 EE3FLTR[3:0] : External Event 3 filter
Refer to EE1FLTR[3:0] description

Bit 12 EE3LTCH : External Event 3 latch
Refer to EE1LTCH description

Bit 11 Reserved, must be kept at reset value.

Bits 10:7 EE2FLTR[3:0] : External Event 2 filter
Refer to EE1FLTR[3:0] description

Bit 6 EE2LTCH : External Event 2 latch
Refer to EE1LTCH description

Bit 5 Reserved, must be kept at reset value.

Bits 4:1 EE1FLTR[3:0] : External Event 1 filter

0000: No filtering

0001: Blanking from counter reset/roll-over to Compare 1

0010: Blanking from counter reset/roll-over to Compare 2

0011: Blanking from counter reset/roll-over to Compare 3

0100: Blanking from counter reset/roll-over to Compare 4

0101: Blanking from another timing unit: TIMFLTR1 source (see Table 311 for details)

0110: Blanking from another timing unit: TIMFLTR2 source (see Table 311 for details)

0111: Blanking from another timing unit: TIMFLTR3 source (see Table 311 for details)

1000: Blanking from another timing unit: TIMFLTR4 source (see Table 311 for details)

1001: Blanking from another timing unit: TIMFLTR5 source (see Table 311 for details)

1010: Blanking from another timing unit: TIMFLTR6 source (see Table 311 for details)

1011: Blanking from another timing unit: TIMFLTR7 source (see Table 311 for details)

1100: Blanking from another timing unit: TIMFLTR8 source (see Table 311 for details)

1101: Windowing from counter reset/roll-over to Compare 2

1110: Windowing from counter reset/roll-over to Compare 3

1111: Windowing from another timing unit: TIMWIN source (see Table 312 for details)

Note: Whenever a compare register is used for filtering, the value must be strictly above 0.

This bitfield must not be modified once the counter is enabled (TxCEN bit set)

Bit 0 EE1LTCH : External Event 1 latch

0: Event 1 is ignored if it happens during a blank, or passed through during a window.

1: Event 1 is latched and delayed till the end of the blanking or windowing period.

Note: A timeout event is generated in window mode (EE1FLTR[3:0]=1101, 1110, 1111) if EE1LTCH = 0, except if the External event is programmed in fast mode (EExFAST = 1).

This bitfield must not be modified once the counter is enabled (TxCEN bit set)

37.5.32 HRTIM Timerx External Event Filtering Register 2 (HRTIM_EEFxR2)

Address offset: 0x50h (this offset address is relative to timer x base address)

Reset value: 0x0000 0000

Bits 31:29 Reserved, must be kept at reset value.

Bits 28:25 EE10FLTR[3:0] : External Event 10 filter

Refer to EE1FLTR[3:0] description

Bit 24 EE10LTCH : External Event 10 latch

Refer to EE1LTCH description

Bit 23 Reserved, must be kept at reset value.

Bits 22:19 EE9FLTR[3:0] : External Event 9 filter

Refer to EE1FLTR[3:0] description

Bit 18 EE9LTCH : External Event 9 latch

Refer to EE1LTCH description

Bit 17 Reserved, must be kept at reset value.

Bits 16:13 EE8FLTR[3:0] : External Event 8 filter

Refer to EE1FLTR[3:0] description

Bit 12 EE8LTCH : External Event 8 latch

Refer to EE1LTCH description

Bit 11 Reserved, must be kept at reset value.

Bits 10:7 EE7FLTR[3:0] : External Event 7 filter

Refer to EE1FLTR[3:0] description

Bit 6 EE7LTCH : External Event 7 latch

Refer to EE1LTCH description

Bit 5 Reserved, must be kept at reset value.

Bits 4:1 EE6FLTR[3:0] : External Event 6 filter

Refer to EE1FLTR[3:0] description

Bit 0 EE6LTCH : External Event 6 latch

Refer to EE1LTCH description

37.5.33 HRTIM Timerx Reset Register (HRTIM_RSTxR)

HRTIM TimerA Reset Register (HRTIM_RSTAR)

Address offset: 0xD4h

Reset value: 0x0000 0000

Bit 31 Reserved, must be kept at reset value.

Bit 30 TECPM4 : Timer E Compare 4

The timer A counter is reset upon timer E Compare 4 event.

Bit 29 TECMP2 : Timer E Compare 2

The timer A counter is reset upon timer E Compare 2 event.

Bit 28 TECMP1 : Timer E Compare 1

The timer A counter is reset upon timer E Compare 1 event.

Bit 27 TDCMP4 : Timer D Compare 4

The timer A counter is reset upon timer D Compare 4 event.

Bit 26 TDCMP2 : Timer D Compare 2

The timer A counter is reset upon timer D Compare 2 event.

Bit 25 TDCMP1 : Timer D Compare 1

The timer A counter is reset upon timer D Compare 1 event.

Bit 24 TCCMP4 : Timer C Compare 4

The timer A counter is reset upon timer C Compare 4 event.

Bit 23 TCCMP2 : Timer C Compare 2

The timer A counter is reset upon timer C Compare 2 event.

Bit 22 TCCMP1 : Timer C Compare 1

The timer A counter is reset upon timer C Compare 1 event.

Bit 21 TBCMP4 : Timer B Compare 4

The timer A counter is reset upon timer B Compare 4 event.

Bit 20 TBCMP2 : Timer B Compare 2

The timer A counter is reset upon timer B Compare 2 event.

Bit 19 TBCMP1 : Timer B Compare 1

The timer A counter is reset upon timer B Compare 1 event.

Bit 18 EXTEVNT10 : External Event

The timer A counter is reset upon external event 10.

Bit 17 EXTEVNT9 : External Event 9

The timer A counter is reset upon external event 9.

1. Bit 16 EXTEVNT8 : External Event 8
   The timer A counter is reset upon external event 8.
2. Bit 15 EXTEVNT7 : External Event 7
   The timer A counter is reset upon external event 7.
3. Bit 14 EXTEVNT6 : External Event 6
   The timer A counter is reset upon external event 6.
4. Bit 13 EXTEVNT5 : External Event 5
   The timer A counter is reset upon external event 5.
5. Bit 12 EXTEVNT4 : External Event 4
   The timer A counter is reset upon external event 4.
6. Bit 11 EXTEVNT3 : External Event 3
   The timer A counter is reset upon external event 3.
7. Bit 10 EXTEVNT2 : External Event 2
   The timer A counter is reset upon external event 2.
8. Bit 9 EXTEVNT1 : External Event 1
   The timer A counter is reset upon external event 1.
9. Bit 8 MSTCMP4 : Master compare 4
   The timer A counter is reset upon master timer Compare 4 event.
10. Bit 7 MSTCMP3 : Master compare 3
    The timer A counter is reset upon master timer Compare 3 event.
11. Bit 6 MSTCMP2 : Master compare 2
    The timer A counter is reset upon master timer Compare 2 event.
12. Bit 5 MSTCMP1 : Master compare 1
    The timer A counter is reset upon master timer Compare 1 event.
13. Bit 4 MSTPER : Master timer Period
    The timer A counter is reset upon master timer period event.
14. Bit 3 CMP4 : Timer A compare 4 reset
    The timer A counter is reset upon Timer A Compare 4 event.
15. Bit 2 CMP2 : Timer A compare 2 reset
    The timer A counter is reset upon Timer A Compare 2 event.
16. Bit 1 UPDT : Timer A Update reset
    The timer A counter is reset upon update event.
17. Bit 0 Reserved, must be kept at reset value.

Address offset: 0x154h

Reset value: 0x0000 0000

Bits 30:1 Refer to HRTIM_RSTAR bits description.