1. Documentation conventions
1.1 General information
The STM32F205xx, STM32F207xx, STM32F215xx and STM32F217xx devices have an Arm ®(a) Cortex ® -M3 core.
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1.2 List of abbreviations for registers
The following abbreviations are used in register descriptions:
| read/write (rw) | Software can read and write to these bits. |
| read-only (r) | Software can only read these bits. |
| write-only (w) | Software can only write to this bit. Reading the bit returns the reset value. |
| read/clear (rc_w1) | Software can read as well as clear this bit by writing 1. Writing '0' has no effect on the bit value. |
| read/clear (rc_w0) | Software can read as well as clear this bit by writing 0. Writing '1' has no effect on the bit value. |
| read/clear by read (rc_r) | Software can read this bit. Reading this bit automatically clears it to '0'. Writing '0' has no effect on the bit value. |
| read/set (rs) | Software can read as well as set this bit. Writing '0' has no effect on the bit value. |
| read-only write trigger (rt_w) | Software can read this bit. Writing '0' or '1' triggers an event but has no effect on the bit value. |
| toggle (t) | Software can only toggle this bit by writing '1'. Writing '0' has no effect. |
| Reserved (Res.) | Reserved bit, must be kept at reset value. |
1.3 Glossary
- • Word: data of 32-bit length.
- • Half-word: data of 16-bit length.
- • Byte: data of 8-bit length.
a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
1.4 Peripheral availability
For peripheral availability and number across all STM32F20x and STM32F21x sales types, refer to the STM32F20x and STM32F21x datasheets.