APB1 peripheral clock enable in low power mode register
| TIM5LPEN | TIM5 clock enable during Sleep mode |
| TIM6LPEN | TIM6 clock enable during Sleep mode |
| LPTIM1LPEN | LPTIM1 clock enable during sleep mode |
| RTCAPBLPEN | RTC APB clock enable during sleep mode |
| WWDGLPEN | Window watchdog clock enable during Sleep mode |
| SPI2LPEN | SPI2 clock enable during Sleep mode |
| USART2LPEN | USART2 clock enable during Sleep mode |
| I2C1LPEN | I2C1 clock enable during Sleep mode |
| I2C2LPEN | I2C2 clock enable during Sleep mode |
| I2C4LPEN | I2C4 clock enable during Sleep mode |
| PWRLPEN | Power interface clock enable during Sleep mode |
| DACLPEN | DAC interface clock enable during sleep mode |