RTC Calendar Register
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| DATE[5:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 1 | |||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| DAY[2:0] | MONTH[4:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| YEAR[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CENT[6:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 1 | 0 | 0 | 0 | 0 | 0 | ||
Current Century
The range that can be set is 19–20 (Gregorian) or 13–14 (Persian) (BCD).
The lowest four bits encode the units. The higher bits encode the tens.
Current Year
The range that can be set is 00–99 (BCD).
The lowest four bits encode the units. The higher bits encode the tens.
Current Month
The range that can be set is 01–12 (BCD).
The lowest four bits encode the units. The higher bits encode the tens.
Current Day in Current Week
The range that can be set is 1–7 (BCD).
The coding of the number (which number represents which day) is user-defined as it has no effect on the date counter.
Current Day in Current Month
The range that can be set is 01–31 (BCD).
The lowest four bits encode the units. The higher bits encode the tens.