Rtc Registers; Rtc Time Register (Rtc_Tr) - STMicroelectronics STM32F05 series Reference Manual

Real-time clock (RTC)
24.6

RTC registers

Refer to
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
Reading the calendar on page
This register is write protected. The write access procedure is described in
write protection on page
Address offset: 0x00
Power-on reset value: 0x0000 0000
System reset: 0x0000 0000 when BYPSHAD = 0. Not affected when BYPSHAD = 1.
31 30 29
Res. Res. Res. Res.
15 14 13
Res. MNT[2:0]
rw rw
Bits 31-23 Reserved, must be kept at reset value
Bit 22 PM: AM/PM notation
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
550/742
Section 1.1 on page 34
540.
28 27 26 25
Res. Res. Res.
12 11 10 9
MNU[3:0]
rw rw rw rw
0: AM or 24-hour format
1: PM
Doc ID 018940 Rev 1
of the reference manual for a list of abbreviations used in
Calendar initialization and configuration on page 540
541.
24 23 22
Res. Res. PM
rw
8 7 6
Res.
rw rw
21 20 19 18
HT[1:0]
rw rw rw rw
5 4 3
ST[2:0]
rw rw rw rw
RM0091
and
RTC register
17 16
HU[3:0]
rw rw
2 1 0
SU[3:0]
rw rw