ST STM32F401 User Manual page 26

Hardware layout
Table 6. MCU pin description versus board function (page 5 of 8)
MCU pin
Main Alternate
function functions
MCO_2, TIM3_CH4,
PC9 I2C3_SDA, I2S2_CKIN,
SDIO_D1
I2S3ext_CK,
PC10 SPI3_SCK/I2S3_CK,
SDIO_D2
I2S3ext_SD,
PC11
SPI3_MISO, SDIO_D3
I2S3ext_MISO,
PC12 SPI3_MOSI/I2S3_SD,
SDIO_CK
PC13 TAMP_1
PC14 OSC32_IN
PC15 OSC32_OUT
PD0
PD1
PD2 TIM3_ETR, SDIO_CMD 83
SPI2_SCK/I2S2_CK,
PD3
USART2_CTS
PD4 USART2_RTS
PD5 USART2_TX
SPI3_MOSI/I2S3_SD,
PD6
USART2_RX
26/39
66
78
79
80
7
8
9
81
82
84
85
86
87
DocID025174 Rev 1
Board function
UM1669
46
37
38
35
12
9
10
36
33
34
31
32
29
30