Rtc Write Protection Register (Rtc_Wpr); Rtc Time Stamp Time Register (Rtc_Tstr) - ST STM32F207 Series Reference Manual

RM0033
Note: This register can be written only when ALRBWF is set to 1 in RTC_ISR, or in initialization
mode.
This register is write protected. The write access procedure is described in
write protection on page
22.6.10

RTC write protection register (RTC_WPR)

Address offset: 0x24
Backup domain reset value: 0x0000 0000
31 30 29
15 14 13
Bits 31:8 Reserved, must be kept at reset value.
Bits 7:0 KEY: Write protection key
This byte is written by software.
Reading this byte always returns 0x00.
Refer to
protection.
22.6.11

RTC time stamp time register (RTC_TSTR)

Address offset: 0x30
Backup domain reset value: 0x0000 0000
System reset: not affected
31 30 29
15 14 13
MNT[2:0]
Res.
r r
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.
Bits 19:16 HU[3:0]: Hour units in BCD format.
Bit 15
Bits 14:12 MNT[2:0]: Minute tens in BCD format.
574.
28 27 26 25
12 11 10 9
Reserved
RTC register write protection
28 27 26 25
Reserved
12 11 10 9
MNU[3:0]
r r r r
0: AM or 24-hour format
1: PM
Reserved, must be kept at reset value.
24 23 22
Reserved
8 7 6
w w
for a description of how to unlock RTC register write
24 23 22
PM
r
8 7 6
ST[2:0]
Res.
r r
RM0033 Rev 9
Real-time clock (RTC)
RTC register
21 20 19 18
5 4 3 2
KEY
w w w w
21 20 19 18
HT[1:0] HU[3:0]
r r r r
5 4 3 2
SU[3:0]
r r r r
17 16
1 0
w w
17 16
r r
1 0
r r
593/1381
597