STM32F050C4 datasheet(29/97 Pages) STMICROELECTRONICS

29 / 97 page

STM32F050xx

Pinouts and pin description

Doc ID 023683 Rev 1

29/97

PB5

I/O

SPI1_MOSI,

I2S1_SD,

I2C1_SMBA,

TIM16_BKIN,

TIM3_CH2

PB6

I/O

FTf

I2C1_SCL,

USART1_TX,

TIM16_CH1N

PB7

I/O

FTf

I2C1_SDA,

USART1_RX,

TIM17_CH1N

BOOT0

Boot memory selection

PB8

I/O

FTf

I2C1_SCL,

TIM16_CH1

PB9

I/O

FTf

I2C1_SDA,

IR_OUT,

TIM17_CH1,

EVENTOUT

VSS

Ground

VDD

Digital power supply

PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current

(3 mA), the use of GPIO PC13 to PC15 in output mode is limited:

- The speed should not exceed 2 MHz with a maximum load of 30 pF

- these GPIOs must not be used as a current sources (e.g. to drive an LED).

After the first backup domain power-up, PC13, PC14 and PC15 operate as GPIOs. Their function then depends on the

content of the Backup registers which is not reset by the main reset. For details on how to manage these GPIOs, refer to the

Battery backup domain and BKP register description sections in the STM32F05xx reference manual.

This alternate feature is available on standard dies only.

After reset, these pins are configured as SWDAT and SWCLK alternate functions, and the internal pull-up on SWDAT pin

and internal pull-down on SWCLK pin are activated.

Table 8.

Pin definitions (continued)

Pin number

Pin name

(function after

reset)

Notes

Pin functions

Alternate functions

Additional

functions

STM32F050C4 Datasheet(PDF) 29 Page - STMicroelectronics

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