Real-time clock (RTC) RM0091
550/742 Doc ID 018940 Rev 1
24.6 RTC registers
Refer to Section 1.1 on page 34 of the reference manual for a list of abbreviations used in
register descriptions.
The peripheral registers can be accessed by words (32-bit).
24.6.1 RTC time register (RTC_TR)
The RTC_TR is the calendar time shadow register. This register must be written in
initialization mode only. Refer to Calendar initialization and configuration on page 540 and
Reading the calendar on page 541.
This register is write protected. The write access procedure is described in RTC register
write protection on page 540.
Address offset: 0x00
Power-on reset value: 0x0000 0000
System reset: 0x0000 0000 when BYPSHAD = 0. Not affected when BYPSHAD = 1.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. PM HT[1:0] HU[3:0]
rw rw rw rw rw rw rw
1514131211109876543210
Res. MNT[2:0] MNU[3:0] Res. ST[2:0] SU[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw
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
Bit 16:16 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
Bit 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
Bit 3:0 SU[3:0]: Second units in BCD format
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