RM0440 Rev 4 1557/2126
RM0440 Real-time clock (RTC)
1592
35.6.2 RTC date register (RTC_DR)
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 page 1547 and
Reading the calendar on page 1549.
This register is write protected. The write access procedure is described in RTC register
write protection on page 1547.
Address offset: 0x04
Backup domain reset value: 0x0000 2101
System reset value: 0x0000 2101 (when BYPSHAD = 0, not affected when BYPSHAD = 1)
Bits 31:23 Reserved, must be kept at reset value.
Bit 22 PM: AM/PM notation
0: AM or 24-hour format
1: PM
Bits 21:20 HT[1:0]: Hour tens in BCD format
Bits 19:16 HU[3:0]: Hour units in BCD format
Bit 15 Reserved, must be kept at reset value.
Bits 14:12 MNT[2:0]: Minute tens in BCD format
Bits 11:8 MNU[3:0]: Minute units in BCD format
Bit 7 Reserved, must be kept at reset value.
Bits 6:4 ST[2:0]: Second tens in BCD format
Bits 3:0 SU[3:0]: Second units in BCD format
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. YT[3:0] YU[3:0]
rw rw rw rw rw rw rw rw
1514131211109876543210
WDU[2:0] MT MU[3:0] Res. Res. DT[1:0] DU[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:24 Reserved, must be kept at reset value.
Bits 23:20 YT[3:0]: Year tens in BCD format
Bits 19:16 YU[3:0]: Year units in BCD format
Bits 15:13 WDU[2:0]: Week day units
000: forbidden
001: Monday
...
111: Sunday
Bit 12 MT: Month tens in BCD format
Bits 11:8 MU[3:0]: Month units in BCD format
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