Alternate Function; Table 5. Alternate Function - ST STM32F4 Series Application Note

4.3

Alternate Function

Each pin of the MCU can be configured to multiple functions. These functions are selected by software.
The full description of I/O alternate functions is described in the datasheet of the selected device and the register, which allow the
pin configuration, are described in the reference manual.
AF0 AF1 AF2
Port
TIM3/4
SYS TIM1/2
/5
TIM1_ TIM3_
PB0 -
CH2N CH3
TIM2_
PB11 -
CH4
TIM1_
PB12 -
BKIN
Port B
TIM1_
PB13 -
CH1N
TIM1_
PB14 -
CH2N
RTC_ TIM1_
PB15
REFIN CH3N
In order to easily explore Peripheral Alternate Functions mapping to pins, it is recommended to use the STM32CubeMX tool
available on www.st.com.

Table 5. Alternate function

AF3 AF4 AF5
TIM8/9 I2C1/2/ SPI1/2/ SPI2/3/
/10/11 3 3/4/5/6
TIM8_
- -
CH2N
I2C2_
- -
SDA
SPI2_
I2C2_SM
- - NSS/
BA
I2S2_WS
SPI2_
- - - SCK/
I2S2_CK
TIM8_ SPI2_MIS
- -
CH2N O
SPI2_
TIM8_
- - MOSI/
CH3N
I2S2_SD
AF6 AF7 AF8 AF9
USA CAN1/2
SPI2/3/
RT6/ /TIM12/
USAR
UAR 13/14/
SAI1
T1/2/3
T4/5/ QUAD
- - - LCD_R3
USART3
- -
_RX
USART3
- - CAN2_RX
_CK
USART3
- - CAN2_TX
_CTS
I2S2ext_ USART3 TIM12_C
-
SD _RTS H1
TIM12_C
- - -
H2
AF10 AF11 AF12 AF13
QUADS FMC/
DCMI/
PI/OTG SDIO/
ETH DSI
2_HS/O OTG2
HOST
TG1_F _
OTG_HS_ ETH_MII_
- -
ULPI_D1 RXD2
ETH_MII_
DSI
OTG_HS TX_EN/
- HOST
_ULPI_D4 ETH_RMII_
_TE
TX_EN
ETH_MII_
OTG_HS_ TXD0/ OTG_
-
ULPI_D5 ETH_RMII_ HS_ID
TXD0
ETH_MII_
OTG_HS_
TXD1/ETH_ - -
ULPI_D6
RMII_TXD1
OTG_
- - -
HS_DM
OTG_H
- - -
S_DP
AF14 AF15
LCD SYS
LCD_ EVENT
G1 OUT
LCD_ EVENT
G5 OUT
EVENT
-
OUT
EVENT
-
OUT
EVENT
-
OUT
EVENT
-
'OUT