Documentation Conventions; General Information; List Of Abbreviations For Registers - ST STM32F412 Reference Manual

RM0402
1

Documentation conventions

1.1

General information

The STM32F412xx devices have an Arm
1.2

List of abbreviations for registers

The following abbreviations
read/write (rw)
read-only (r)
write-only (w)
read/clear write0 (rc_w0)
read/clear write1 (rc_w1)
read/clear write (rc_w)
read/clear by read (rc_r)
read/set by read (rs_r)
read/set (rs)
read/write once (rwo)
toggle (t)
read-only write trigger (rt_w1) Software can read this bit. Writing 1 triggers an event but has no effect on
Reserved (Res.)
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 STMicroelectronics microcontrollers, some of
them may not be used in the current document.
(b)
are used in register descriptions:
Software can read and write to this bit.
Software can only read this bit.
Software can only write to this bit. Reading this bit returns the reset value.
Software can read as well as clear this bit by writing 0. Writing 1 has no
effect on the bit value.
Software can read as well as clear this bit by writing 1. Writing 0 has no
effect on the bit value.
Software can read as well as clear this bit by writing to the register. The
value written to this bit is not important.
Software can read this bit. Reading this bit automatically clears it to 0.
Writing this bit has no effect on the bit value.
Software can read this bit. Reading this bit automatically sets it to 1.
Writing this bit has no effect on the bit value.
Software can read as well as set this bit. Writing 0 has no effect on the bit
value.
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.
The software can toggle this bit by writing 1. Writing 0 has no effect.
the bit value.
Reserved bit, must be kept at reset value.
RM0402 Rev 6
Documentation conventions
®(a)
®
Cortex -M4 with FPU core.
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