Datasheet
STM32L073xx Pin descriptions
DocID027096 Rev 2 51/137
Table 18. Alternate functions port B
Port
AF0 AF1 AF2 AF3 AF4 AF5 AF6 AF7
SPI1/SPI2/I2S2/
USART1/2/
LPUART1/USB/
LPTIM1/TSC/
TIM2/21/22/
EVENTOUT/
SYS_AF
SPI1/SPI2/I2S2/I
2C1/LCD/
TIM2/21
SPI1/SPI2/I2S2/
LPUART1/
USART5/USB/L
PTIM1/TIM2/3/E
VENTOUT/
SYS_AF
I2C1/TSC/
EVENTOUT
I2C1/USART1/2/
LPUART1/
TIM3/22/
EVENTOUT
SPI2/I2S2/I2C2/
USART1/
TIM2/21/22
I2C1/2/
LPUART1/
USART4/
UASRT5/TIM21/
EVENTOUT
I2C3/LPUART1/
COMP1/2/
TIM3
Port B
PB0 EVENTOUT LCD_SEG5 TIM3_CH3 TSC_G3_IO2 - - - -
PB1 - LCD_SEG6 TIM3_CH4 TSC_G3_IO3 LPUART1_RTS_DE - - -
PB2 - - LPTIM1_OUT TSC_G3_IO4 - - - I2C3_SMBA
PB3 SPI1_SCK LCD_SEG7 TIM2_CH2 TSC_G5_IO1 EVENTOUT USART1_RTS_DE USART5_TX -
PB4 SPI1_MISO LCD_SEG8 TIM3_CH1 TSC_G5_IO2 TIM22_CH1 USART1_CTS USART5_RX I2C3_SDA
PB5 SPI1_MOSI LCD_SEG9 LPTIM1_IN1 I2C1_SMBA
TIM3_CH2/
TIM22_CH2
USART1_CK
USART5_CK/
USART5_RTS_D
E
-
PB6 USART1_TX I2C1_SCL LPTIM1_ETR TSC_G5_IO3 - - - -
PB7 USART1_RX I2C1_SDA LPTIM1_IN2 TSC_G5_IO4 - - USART4_CTS -
PB8 - LCD_SEG16 - TSC_SYNC I2C1_SCL - - -
PB9 - LCD_COM3 EVENTOUT - I2C1_SDA
SPI2_NSS/
I2S2_WS
--
PB10 - LCD_SEG10 TIM2_CH3 TSC_SYNC LPUART1_TX SPI2_SCK I2C2_SCL LPUART1_RX
PB11 EVENTOUT LCD_SEG11 TIM2_CH4 TSC_G6_IO1 LPUART1_RX - I2C2_SDA LPUART1_TX
PB12 SPI2_NSS/I2S2_WS LCD_SEG12
LPUART1_RTS_
DE
TSC_G6_IO2 I2C2_SMBA EVENTOUT -
PB13 SPI2_SCK/I2S2_CK LCD_SEG13 MCO TSC_G6_IO3 LPUART1_CTS I2C2_SCL TIM21_CH1 -
PB14
SPI2_MISO/
I2S2_MCK
LCD_SEG14 RTC_OUT TSC_G6_IO4 LPUART1_RTS_DE I2C2_SDA TIM21_CH2 -
PB15
SPI2_MOSI/
I2S2_SD
LCD_SEG15 RTC_REFIN - - - - -
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