ST STM32F405 Reference Manual page 238

Reset and clock control for STM32F405xx/07xx and STM32F415xx/17xx(RCC)
Bit 26 CAN2RST: CAN2 reset
Bit 25 CAN1RST: CAN1 reset
Bit 24 Reserved, must be kept at reset value.
Bit 23 I2C3RST: I2C3 reset
Bit 22 I2C2RST: I2C2 reset
Bit 21 I2C1RST: I2C1 reset
Bit 20 UART5RST: UART5 reset
Bit 19 UART4RST: USART4 reset
Bit 18 USART3RST: USART3 reset
Bit 17 USART2RST: USART2 reset
Bit 16 Reserved, must be kept at reset value.
Bit 15 SPI3RST: SPI3 reset
Bit 14 SPI2RST: SPI2 reset
238/1749
Set and cleared by software.
0: does not reset CAN2
1: resets CAN2
Set and cleared by software.
0: does not reset CAN1
1: resets CAN1
Set and cleared by software.
0: does not reset I2C3
1: resets I2C3
Set and cleared by software.
0: does not reset I2C2
1: resets I2C2
Set and cleared by software.
0: does not reset I2C1
1: resets I2C1
Set and cleared by software.
0: does not reset UART5
1: resets UART5
Set and cleared by software.
0: does not reset UART4
1: resets UART4
Set and cleared by software.
0: does not reset USART3
1: resets USART3
Set and cleared by software.
0: does not reset USART2
1: resets USART2
Set and cleared by software.
0: does not reset SPI3
1: resets SPI3
Set and cleared by software.
0: does not reset SPI2
1: resets SPI2
RM0090 Rev 18
RM0090