Documentation conventions RM0440
72/2126 RM0440 Rev 4
1 Documentation conventions
1.1 General information
The STM32G4 Series devices have an Arm
®(a)
Cortex
®
-M4 with FPU core.
1.2 List of abbreviations for registers
The following abbreviations
(b)
are used in register descriptions:
a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
b. This is an exhaustive list of all abbreviations applicable to STM microcontrollers, some of them may not be
used in the current document.
read/write (rw) Software can read and write to this bit.
read-only (r) Software can only read this bit.
write-only (w) Software can only write to this bit. Reading this bit returns the reset value.
read/clear write0 (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 write1 (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 write (rc_w) Software can read as well as clear this bit by writing to the register. The
value written to this bit is not important.
read/clear by read (rc_r) Software can read this bit. Reading this bit automatically clears it to 0.
Writing this bit has no effect on the bit value.
read/set by read (rs_r) Software can read this bit. Reading this bit automatically sets it to 1.
Writing this bit 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/write once (rwo) Software can only write once to this bit and can also read it at any time.
Only a reset can return the bit to its reset value.
toggle (t) The software can toggle this bit by writing 1. Writing 0 has no effect.
read-only write trigger (rt_w1) Software can read this bit. Writing 1 triggers an event but has no effect on
the bit value.
Reserved (Res.) Reserved bit, must be kept at reset value.
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