APB1SMENR1
| TIM2SMEN | TIM2 timer clocks enable during CPU1 Sleep mode |
| LCDSMEN | LCD clocks enable during CPU1 Sleep mode |
| RTCAPBSMEN | RTC APB clocks enable during CPU1 Sleep mode |
| WWDGSMEN | Window watchdog clocks enable during CPU1 Sleep mode |
| SPI2SMEN | SPI2 clocks enable during CPU1 Sleep mode |
| I2C1SMEN | I2C1 clocks enable during CPU1 Sleep mode |
| I2C3SMEN | I2C3 clocks enable during CPU1 Sleep mode |
| CRSMEN | CRS clocks enable during CPU1 Sleep mode |
| USBSMEN | USB FS clocks enable during CPU1 Sleep mode |
| LPTIM1SMEN | Low power timer 1 clocks enable during CPU1 Sleep mode |