RCC APB2 Sleep enable register
| TIM1LPENC | TIM1 sleep enable |
| TIM8LPENC | TIM8 sleep enable |
| USART1LPENC | USART1 sleep enable |
| USART6LPENC | USART6 sleep enable |
| UART9LPENC | UART9 sleep enable |
| USART10LPENC | USART10 sleep enable |
| SPI1LPENC | SPI1 sleep enable |
| SPI4LPENC | SPI4 sleep enable |
| TIM18LPENC | TIM18 sleep enable |
| TIM15LPENC | TIM15 sleep enable |
| TIM16LPENC | TIM16 sleep enable |
| TIM17LPENC | TIM17 sleep enable |
| TIM9LPENC | TIM9 sleep enable |
| SPI5LPENC | SPI5 sleep enable |
| SAI1LPENC | SAI1 sleep enable |
| SAI2LPENC | SAI2 sleep enable |