RM0453 Rev 1 1027/1461
RM0453 Real-time clock (RTC)
1057
32.6.8 RTC write protection register (RTC_WPR)
Address offset: 0x24
Reset value: 0x0000 0000
32.6.9 RTC calibration register (RTC_CALR)
This register is write protected. The write access procedure is described in RTC register
write protection on page 1007.
Address offset: 0x28
Backup domain reset value: 0x0000 0000
System reset: not affected
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. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. KEY[7:0]
wwwwwwww
Bits 31:8 Reserved, must be kept at reset value.
Bits 7:0 KEY[7:0]: Write protection key
This byte is written by software.
Reading this byte always returns 0x00.
Refer to RTC register write protection for a description of how to unlock 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. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
CALP CALW8
CALW
16
LPCAL Res. Res. Res. CALM[8:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw
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