Table 9. Alternate Function Input/Output - STMicroelectronics STM32L151RE Manual

Alternate functions
AFIO0 AFIO1
Port name
SYSTEM TIM2
BOOT0 BOOT0
NRST NRST
TIM2_CH1_
PA0-WKUP1 -
ETR
PA1 - TIM2_CH2
PA2 - TIM2_CH3
PA3 - TIM2_CH4
PA4 -
TIM2_CH1_
PA5 -
ETR
PA6 -
PA7 -
PA8 MCO
PA9 -
PA10 -

Table 9. Alternate function input/output

Digital alternate function number
AFIO2 AFIO3 AFIO4
TIM3/4/ TIM9/
I2C1/2
5 10/11
- - - -
- - - -
TIM5_CH1 - -
TIM5_CH2 - -
TIM5_CH3 TIM9_CH1 -
TIM5_CH4 TIM9_CH2 -
- - - -
- - -
- TIM3_CH1 TIM10_CH1 -
- TIM3_CH2 TIM11_CH1 -
- - - -
- - - -
- - - -
AFIO5 AFIO6 AFIO7
Alternate function
USART1/2/
SPI1/2 SPI3
3
- - -
- - -
- - USART2_CTS
- - USART2_RTS
- - USART2_TX
- - USART2_RX
SPI3_NSS
SPI1_NSS USART2_CK
I2S3_WS
SPI1_SCK - -
SPI1_MISO - -
SPI1_MOSI - -
- - USART1_CK
- - USART1_TX
- - USART1_RX
. .
AFIO8 AFIO11 AFIO14 AFIO15
. .
UART4/
- LCD - CPRI SYSTEM
5
EVENT
- - - - -
OUT
- - - - -
EVENT
- - - - TIMx_IC1
OUT
EVENT
- - SEG0 - TIMx_IC2
OUT
EVENT
- - SEG1 - TIMx_IC3
OUT
EVENT
- - SEG2 - TIMx_IC4
OUT
EVENT
- - - - TIMx_IC1
OUT
EVENT
- - - - TIMx_IC2
OUT
EVENT
- - SEG3 - TIMx_IC3
OUT
EVENT
- - SEG4 - TIMx_IC4
OUT
EVENT
- - COM0 - TIMx_IC1
OUT
EVENT
- - COM1 - TIMx_IC2
OUT
EVENT
- - COM2 - TIMx_IC3
OUT
-