Documentation Conventions; List Of Abbreviations For Registers - ST STM32F446 Series Reference Manual

RM0390
1

Documentation conventions

1.1

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 (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. This is an exhaustive list of all abbreviations applicable to STM microcontrollers, some of them may not be
used in the current document.
(a)
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 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.
RM0390 Rev 4
Documentation conventions
51/1328
52