STMicroelectronics STM32F405 Reference Manual page 241

RM0090 Reset and clock control for STM32F405xx/07xx and STM32F415xx/17xx(RCC)
Bit 8 ADCRST: ADC interface reset (common to all ADCs)
Bits 7:6 Reserved, must be kept at reset value.
Bit 5 USART6RST: USART6 reset
Bit 4
Bits 3:2 Reserved, must be kept at reset value.
Bit 1 TIM8RST: TIM8 reset
Bit 0 TIM1RST: TIM1 reset
Set and cleared by software.
0: does not reset the ADC interface
1: resets the ADC interface
Set and cleared by software.
0: does not reset USART6
1: resets USART6
USART1RST: USART1 reset
Set and cleared by software.
0: does not reset USART1
1: resets USART1
Set and cleared by software.
0: does not reset TIM8
1: resets TIM8
Set and cleared by software.
0: does not reset TIM1
1: resets TIM1
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