control register
| WATCLK | Wakeup timer clock selection |
| TSEDG | Timestamp trigger edge |
| RCDEN | Reference clock detection enable |
| DREN | Date/time register direct read enable |
| HM | Hour mode |
| CCALEN | Coarse calibration enable |
| ALAEN | Alarm A enable |
| ALBEN | Alarm B enable |
| WATEN | Wakeup timer enable |
| TSEN | Timestamp enable |
| ALAIEN | Alarm A interrupt enable |
| ALBIEN | Alarm B interrupt enable |
| WATIEN | Wakeup timer interrupt enable |
| TSIEN | Timestamp interrupt enable |
| ADD1H | Add 1 hour |
| DEC1H | Decrease 1 hour |
| BPR | Battery power domain data register |
| CALOSEL | Calibration output selection |
| OUTP | Output polarity |
| OUTSEL | Output source selection |
| CALOEN | Calibration output enable |