RCC APB2 Clock Register
| TIM1EN | TIM1 peripheral clock enable |
| TIM8EN | TIM8 peripheral clock enable |
| USART1EN | USART1 Peripheral Clocks Enable |
| USART6EN | USART6 Peripheral Clocks Enable |
| SPI1EN | SPI1 Peripheral Clocks Enable |
| SPI4EN | SPI4 Peripheral Clocks Enable |
| TIM15EN | TIM15 peripheral clock enable |
| TIM16EN | TIM16 peripheral clock enable |
| TIM17EN | TIM17 peripheral clock enable |
| SPI5EN | SPI5 Peripheral Clocks Enable |
| SAI1EN | SAI1 Peripheral Clocks Enable |
| SAI2EN | SAI2 Peripheral Clocks Enable |
| SAI3EN | SAI3 Peripheral Clocks Enable |
| DFSDM1EN | DFSDM1 Peripheral Clocks Enable |
| HRTIMEN | HRTIM peripheral clock enable |