STM32F051X4 datasheet(31/122 Pages) STMICROELECTRONICS

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Pinouts and pin descriptions

Table 12. Legend/abbreviations used in the pinout table

Name

Abbreviation

Definition

Pin name

Unless otherwise specified in brackets below the pin name, the pin function during and

after reset is the same as the actual pin name

Pin type

Supply pin

Input-only pin

I/O

Input / output pin

I/O structure

5 V-tolerant I/O

FTf

5 V-tolerant I/O, FM+ capable

TTa

3.3 V-tolerant I/O directly connected to ADC

Standard 3.3 V I/O

Dedicated BOOT0 pin

RST

Bidirectional reset pin with embedded weak pull-up resistor

Notes

Unless otherwise specified by a note, all I/Os are set as floating inputs during and after

reset.

functions

Alternate

functions

Functions selected through GPIOx_AFR registers

Additional

functions

Functions directly selected/enabled through peripheral registers

Table 13. Pin definitions

Pin number

Pin name

(function upon

reset)

Pin functions

Alternate functions

Additional

functions

VBAT

Backup power supply

PC13

I/O

(1)(2)

RTC_TAMP1,

RTC_TS,

RTC_OUT,

WKUP2

3A1

PC14-OSC32_IN

(PC14)

I/O

(1)(2)

OSC32_IN

4B1

PC15-OSC32_OUT

(PC15)

I/O

(1)(2)

OSC32_OUT

5C1

PF0-OSC_IN

(PF0)

I/O

OSC_IN

6D1

PF1-OSC_OUT

(PF1)

I/O

OSC_OUT

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