APB peripheral reset register 1
| TIM3RST | TIM3 timer reset |
| TIM4RST | TIM4 timer reset |
| TIM6RST | TIM6 timer reset |
| TIM7RST | TIM7 timer reset |
| USART5RST | USART5RST |
| USART6RST | USART6RST |
| USBRST | USBRST |
| SPI2RST | SPI2 reset |
| SPI3RST | SPI3 reset |
| USART2RST | USART2 reset |
| USART3RST | USART3 reset |
| USART4RST | USART4 reset |
| I2C1RST | I2C1 reset |
| I2C2RST | I2C2 reset |
| I2C3RST | I2C3RST reset |
| DBGRST | Debug support reset |
| PWRRST | Power interface reset |