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General-purpose I/Os (GPIO) RM0402

172/1163 RM0402 Rev 6

Figure 18. Selecting an alternate function on STM32F412xx

MSv39420V1

For pins 0 to 7, the GPIOx_AFRL[31:0] register selects the dedicated alternate function

AF0 (system)

AF1 (TIM1/TIM2)

AF2 (TIM3/5)

AF3 (TIM8/9)

AF4 (I2C1..3, I2CFMP1)

AF5 (SPI1/2/3/4)

AF6 (SPI2/3/4, DFSDM)

AF7 (SPI2, USART1..3)

AF8 (DFSDM, USART3/6, CAN1)

AF9 (I2C1..3, I2CFMP1, CAN1/2, TIM12..14, QUADSPI)

AF10 (DFSDM, FSMC, QUADSPI, OTG_FS)

AF11

AF12 (FMC, SDIO)

AF13

AF14

AF15 (EVENTOUT)

Pin x (x = 0..7)

AFRL[31:0]

For pins 8 to 15, the GPIOx_AFRH[31:0] register selects the dedicated alternate function

Pin x (x = 8..15)

AFRH[31:0]