CR
| WUCKSEL | Wakeup clock selection |
| TSEDGE | Timestamp event active edge |
| REFCKON | RTC_REFIN reference clock detection enable (50 or 60 Hz) |
| BYPSHAD | Bypass the shadow registers |
| FMT | Hour format |
| SSRUIE | SSR underflow interrupt enable |
| ALRAE | Alarm A enable |
| ALRBE | Alarm B enable |
| WUTE | Wakeup timer enable |
| TSE | timestamp enable |
| ALRAIE | Alarm A interrupt enable |
| ALRBIE | Alarm B interrupt enable |
| WUTIE | Wakeup timer interrupt enable |
| TSIE | Timestamp interrupt enable |
| ADD1H | Add 1 hour (summer time change) |
| SUB1H | Subtract 1 hour (winter time change) |
| BKP | Backup |
| COSEL | Calibration output selection |
| POL | Output polarity |
| OSEL | Output selection |
| COE | Calibration output enable |
| ITSE | timestamp on internal event enable |
| TAMPTS | Activate timestamp on tamper detection event |
| TAMPOE | Tamper detection output enable on TAMPALRM |
| TAMPALRM_PU | TAMPALRM pull-up enable |
| TAMPALRM_TYPE | TAMPALRM output type |
| OUT2EN | RTC_OUT2 output enable |