Table 12. Legend/Abbreviations Used In The Pinout Table - STMicroelectronics STM32F042G4 Manual

Pinouts and pin descriptions
Name
Pin name
Pin type
I/O structure
Notes
Alternate
functions
Pin
functions
Additional
functions
32/117

Table 12. Legend/abbreviations used in the pinout table

Abbreviation
Unless otherwise specified in brackets below the pin name, the pin function during and
after reset is the same as the actual pin name
S Supply pin
I Input only pin
I/O Input / output pin
FT 5 V tolerant I/O
FTf 5 V tolerant I/O, FM+ capable
TTa 3.3 V tolerant I/O directly connected to ADC
TC Standard 3.3 V I/O
RST Bidirectional reset pin with embedded weak pull-up resistor
Unless otherwise specified by a note, all I/Os are set as floating inputs during and after
reset.
Functions selected through GPIOx_AFR registers
Functions directly selected/enabled through peripheral registers
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STM32F042xx
Definition