The RTC_DR is the calendar date shadow register. This register must be written in initialization mode only. Refer to Calendar initialization and configuration on page9 and Reading the calendar on page10.This register is write protected. The write access procedure is described in RTC register write protection on page9.
| DU | Date units in BCD format |
| DT | Date tens in BCD format |
| MU | Month units in BCD format |
| MT | Month tens in BCD format |
| WDU | Week day units |
| YU | Year units in BCD format |
| YT | Year tens in BCD format |