APB1 peripheral clock enable register
| TIM2EN | TIM2 clock enable |
| TIM3EN | TIM3 clock enable |
| TIM4EN | TIM4 clock enable |
| TIM5EN | TIM5 clock enable |
| TIM6EN | TIM6 clock enable |
| TIM7EN | TIM7 clock enable |
| TIM12EN | TIM12 clock enable |
| TIM13EN | TIM13 clock enable |
| TIM14EN | TIM14 clock enable |
| WWDGEN | Window watchdog clock enable |
| SPI2EN | SPI2 clock enable |
| SPI3EN | SPI3 clock enable |
| SPDIFEN | SPDIF-IN clock enable |
| USART2EN | USART 2 clock enable |
| USART3EN | USART3 clock enable |
| UART4EN | UART4 clock enable |
| UART5EN | UART5 clock enable |
| I2C1EN | I2C1 clock enable |
| I2C2EN | I2C2 clock enable |
| I2C3EN | I2C3 clock enable |
| I2CFMP1EN | I2CFMP1 clock enable |
| CAN1EN | CAN 1 clock enable |
| CAN2EN | CAN 2 clock enable |
| CEC | CEC interface clock enable |
| PWREN | Power interface clock enable |
| DACEN | DAC interface clock enable |