Datasheet
STM32L031x4/6 Pin descriptions
DS10668 Rev 6 45/126
Table 16. Alternate functions
Ports
AF0 AF1 AF2 AF3 AF4 AF5 AF6 AF7
SPI1/USART2
/LPTIM/TIM21
/EVENTOUT/
SYS_AF
SPI1/I2C1/
LPTIM
LPTIM/TIM2/
EVENTOUT/
SYS_AF
I2C1/
EVENTOUT
I2C1/USART2/
LPUART1/
TIM22/
EVENTOUT
TIM2/21/22
LPUART1/
EVENTOUT
COMP1/2
Port A
PA0 - LPTIM1_IN1 TIM2_CH1 - USART2_CTS TIM2_ETR - COMP1_OUT
PA1 EVENTOUT LPTIM1_IN2 TIM2_CH2 I2C1_SMBA
USART2_RTS/
USART2_DE
TIM21_ETR - -
PA2 TIM21_CH1 - TIM2_CH3 - USART2_TX - LPUART1_TX COMP2_OUT
PA3 TIM21_CH2 - TIM2_CH4 - USART2_RX - LPUART1_RX
PA4 SPI1_NSS LPTIM1_IN1 - - USART2_CK TIM22_ETR - -
PA5 SPI1_SCK LPTIM1_IN2 TIM2_ETR - - TIM2_CH1 - -
PA6 SPI1_MISO LPTIM1_ETR - - LPUART1_CTS TIM22_CH1 EVENTOUT COMP1_OUT
PA7 SPI1_MOSI LPTIM1_OUT - - USART2_CTS TIM22_CH2 EVENTOUT COMP2_OUT
PA8 MCO - LPTIM1_IN1 EVENTOUT USART2_CK TIM2_CH1 - -
PA9 MCO I2C1_SCL - - USART2_TX TIM22_CH1 - -
PA10 - I2C1_SDA - - USART2_RX TIM22_CH2 - -
PA11 SPI1_MISO - EVENTOUT - USART2_CTS TIM21_CH2 - COMP1_OUT
PA12 SPI1_MOSI - EVENTOUT -
USART2_RTS/
USART2_DE
--COMP2_OUT
PA13 SWDIO LPTIM1_ETR - - - - LPUART1_RX -
PA14 SWCLK LPTIM1_OUT - I2C1_SMBA USART2_TX - LPUART1_TX -
PA15 SPI1_NSS - TIM2_ETR EVENTOUT USART2_RX TIM2_CH1 - -
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