RCC APB1L enable register
| TIM2ENS | TIM2 enable |
| TIM3ENS | TIM3 enable |
| TIM4ENS | TIM4 enable |
| TIM5ENS | TIM5 enable |
| TIM6ENS | TIM6 enable |
| TIM7ENS | TIM7 enable |
| TIM12ENS | TIM12 enable |
| TIM13ENS | TIM13 enable |
| TIM14ENS | TIM14 enable |
| LPTIM1ENS | LPTIM1 enable |
| WWDGENS | WWDG enable |
| TIM10ENS | TIM10 enable |
| TIM11ENS | TIM11 enable |
| SPI2ENS | SPI2 enable |
| SPI3ENS | SPI3 enable |
| SPDIFRX1ENS | SPDIFRX1 enable |
| USART2ENS | USART2 enable |
| USART3ENS | USART3 enable |
| UART4ENS | UART4 enable |
| UART5ENS | UART5 enable |
| I2C1ENS | I2C1 enable |
| I2C2ENS | I2C2 enable |
| I2C3ENS | I2C3 enable |
| I3C1ENS | I3C1 enable |
| I3C2ENS | I3C2 enable |
| UART7ENS | UART7 enable |
| UART8ENS | UART8 enable |