APB1 peripheral clock enable in sleep mode register
| TIM2SMEN | Timer2 clock enable during sleep mode bit |
| TIM3SMEN | Timer3 clock enable during Sleep mode bit |
| TIM6SMEN | Timer 6 clock enable during sleep mode bit |
| TIM7SMEN | Timer 7 clock enable during Sleep mode bit |
| WWDGSMEN | Window watchdog clock enable during sleep mode bit |
| SPI2SMEN | SPI2 clock enable during sleep mode bit |
| USART2SMEN | UART2 clock enable during sleep mode bit |
| LPUART1SMEN | LPUART1 clock enable during sleep mode bit |
| USART4SMEN | USART4 clock enable during Sleep mode bit |
| USART5SMEN | USART5 clock enable during Sleep mode bit |
| I2C1SMEN | I2C1 clock enable during sleep mode bit |
| I2C2SMEN | I2C2 clock enable during sleep mode bit |
| USBSMEN | USB clock enable during sleep mode bit |
| CRSSMEN | Clock recovery system clock enable during sleep mode bit |
| PWRSMEN | Power interface clock enable during sleep mode bit |
| DACSMEN | DAC interface clock enable during sleep mode bit |
| I2C3SMEN | 2C3 clock enable during Sleep mode bit |
| LPTIM1SMEN | Low power timer clock enable during sleep mode bit |