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Real-time clock (RTC) RM0401

502/771 RM0401 Rev 3

21.6 RTC registers

Refer to Section 1.2 on page 34 of this reference manual for a list of abbreviations used in

The peripheral registers have to be accessed by words (32 bits).

21.6.1 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 and Reading the

calendar.

Address offset: 0x00

Backup domain reset value: 0x0000 0000

System reset: 0x0000 0000 when BYPSHAD = 0. Not affected when BYPSHAD = 1.

Note: This register is write protected. The write access procedure is described in RTC register

write protection.

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 31-24 Reserved, must be kept at reset value

Bit 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

ST STM32F410 User Manual

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