APB1 peripheral clock enable in low power mode register
| TIM2LPEN | TIM2 clock enable during Sleep mode  |  
| TIM3LPEN | TIM3 clock enable during Sleep mode  |  
| TIM4LPEN | TIM4 clock enable during Sleep mode  |  
| TIM5LPEN | TIM5 clock enable during Sleep mode  |  
| TIM6LPEN | TIM6LPEN  |  
| TIM7LPEN | TIM7LPEN  |  
| TIM12LPEN | TIM12LPEN  |  
| TIM13LPEN | TIM13LPEN  |  
| TIM14LPEN | TIM14LPEN  |  
| RTCAPBLPEN | : RTC APB clock enable during Sleep mode  |  
| WWDGLPEN | Window watchdog clock enable during Sleep mode  |  
| SPI2LPEN | SPI2 clock enable during Sleep mode  |  
| SPI3LPEN | SPI3 clock enable during Sleep mode  |  
| USART2LPEN | USART2 clock enable during Sleep mode  |  
| USART3LPEN | USART3LPEN  |  
| I2C1LPEN | I2C1 clock enable during Sleep mode  |  
| I2C2LPEN | I2C2 clock enable during Sleep mode  |  
| I2C3LPEN | I2C3 clock enable during Sleep mode  |  
| I2C4LPEN | I2C4LPEN  |  
| CAN1LPEN | CAN1LPEN  |  
| CAN2LPEN | CAN2LPEN  |  
| PWRLPEN | Power interface clock enable during Sleep mode  |