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STM32F051x4 STM32F051x6 STM32F051x8
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Table 14. Alternate functions selected through GPIOA_AFR registers for port A
Pin name AF0 AF1 AF2 AF3 AF4 AF5 AF6 AF7
PA0 - USART2_CTS TIM2_CH1_ETR TSC_G1_IO1 - - COMP1_OUT
PA1 EVENTOUT USART2_RTS TIM2_CH2 TSC_G1_IO2 - -
PA2 TIM15_CH1 USART2_TX TIM2_CH3 TSC_G1_IO3 - - - COMP2_OUT
PA3 TIM15_CH2 USART2_RX TIM2_CH4 TSC_G1_IO4 - - - -
PA4 SPI1_NSS, I2S1_WS USART2_CK - TSC_G2_IO1 TIM14_CH1 - - -
PA5 SPI1_SCK, I2S1_CK CEC TIM2_CH1_ETR TSC_G2_IO2 - - - -
PA6 SPI1_MISO, I2S1_MCK TIM3_CH1 TIM1_BKIN TSC_G2_IO3 TIM16_CH1 EVENTOUT COMP1_OUT
PA7 SPI1_MOSI, I2S1_SD TIM3_CH2 TIM1_CH1N TSC_G2_IO4 TIM14_CH1 TIM17_CH1 EVENTOUT COMP2_OUT
PA8 MCO USART1_CK TIM1_CH1 EVENTOUT - - -
PA9 TIM15_BKIN USART1_TX TIM1_CH2 TSC_G4_IO1 - - - -
PA10 TIM17_BKIN USART1_RX TIM1_CH3 TSC_G4_IO2 - - - -
PA11 EVENTOUT USART1_CTS TIM1_CH4 TSC_G4_IO3 - - - COMP1_OUT
PA12 EVENTOUT USART1_RTS TIM1_ETR TSC_G4_IO4 - - - COMP2_OUT
PA13 SWDIO IR_OUT - - - - -
PA14 SWCLK USART2_TX - - - - - -
PA15 SPI1_NSS, I2S1_WS USART2_RX TIM2_CH1_ETR EVENTOUT - - -
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