initialization and status register
| ALAWF | Alarm A register allows write flag |
| ALBWF | Alarm B register allows write flag |
| WATWF | Wakeup timer register allows write flag |
| TADJF | Time adjustment flag |
| INITF | Calendar initialization flag |
| UPDF | Calendar update flag |
| IMF | Enter initialization mode flag |
| IMEN | Initialization mode enable |
| ALAF | Alarm A flag |
| ALBF | Alarm B flag |
| WATF | Wakeup timer flag |
| TSF | Timestamp flag |
| TSOF | Timestamp overflow flag |
| TP1F | Tamper detection 1 flag |
| CALUPDF | Calibration value update completed flag |