Documentation conventions RM0008
46/1096 Doc ID 13902 Rev 12
2 Documentation conventions
2.1 List of abbreviations for registers
The following abbreviations are used in register descriptions:
2.2 Glossary
● Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
● Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
● High-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 256 and 512 Kbytes.
● XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the
Flash memory density ranges between 768 Kbytes and 1 Mbyte.
● Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
● Word: data of 32-bit length.
● Half-word: data of 16-bit length.
● Byte: data of 8-bit length.
2.3 Peripheral availability
For peripheral availability and number across all STM32F10xxx sales types, please refer to
the low-, medium-, high- and XL-density STM32F101xx and STM32F103xx datasheets, to
the low- and medium-density STM32F102xx datasheets and to the connectivity line devices,
STM32F105xx/STM32F107xx.
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.
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