STM32F091 datasheet(40/127 Pages) STMICROELECTRONICS

40 / 127 page

Pinouts and pin descriptions

STM32F091xB STM32F091xC

40/127

DocID026284 Rev 3

PB5

I/O

SPI1_MOSI, I2S1_SD,

I2C1_SMBA,

TIM16_BKIN,

TIM3_CH2,

USART5_CK_RTS

WKUP6

PB6

I/O

FTf

I2C1_SCL, USART1_TX,

TIM16_CH1N,

TSC_G5_I03

PB7

I/O

FTf

I2C1_SDA, USART1_RX,

USART4_CTS,

TIM17_CH1N,

TSC_G5_IO4

PF11-BOOT0

I/O

Boot memory

selection

PB8

I/O

FTf

I2C1_SCL, CEC,

TIM16_CH1, TSC_SYNC,

CAN_RX

PB9

I/O

FTf

SPI2_NSS, I2S2_WS,

I2C1_SDA, IR_OUT,

TIM17_CH1, EVENTOUT,

CAN_TX

PE0

I/O

EVENTOUT, TIM16_CH1

PE1

I/O

EVENTOUT, TIM17_CH1

VSS

Ground

100 E4

VDD

Digital power supply

1. 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 GPIOs 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 current sources (e.g. to drive an LED).

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

of the RTC registers which are not reset by the system reset. For details on how to manage these GPIOs, refer to the RTC

domain and RTC register descriptions in the reference manual.

3. PC6, PC7, PC8, PC9, PA8, PA9, PA10, PA11, PA12, PA13, PF6, PA14, PA15, PC10, PC11, PC12, PD0, PD1 and PD2 I/Os

are supplied by VDDIO2

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

and the internal pull-down on the SWCLK pin are activated.

Table 13. STM32F091xB/xC pin definitions (continued)

Pin numbers

Pin name

(function upon

reset)

Pin functions

Alternate functions

Additional

functions

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