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Real-time clock (RTC)
32.6.8
RTC write protection register (RTC_WPR)
Address offset: 0x24
Reset value: 0x0000 0000
31
30
29
Res.
Res.
Res.
Res.
15
14
13
Res.
Res.
Res.
Res.
Bits 31:8 Reserved, must be kept at reset value.
Bits 7:0 KEY[7:0]: Write protection key
32.6.9
RTC calibration register (RTC_CALR)
This register is write protected. The write access procedure is described in
write protection on page
Address offset: 0x28
Backup domain reset value: 0x0000 0000
System reset: not affected
31
30
29
Res.
Res.
Res.
Res.
15
14
13
CALW
CALP
CALW8
LPCAL
16
rw
rw
rw
1018/1450
28
27
26
25
Res.
Res.
Res.
12
11
10
9
Res.
Res.
Res.
This byte is written by software.
Reading this byte always returns 0x00.
Refer to
RTC register write protection
protection.
998.
28
27
26
25
Res.
Res.
Res.
12
11
10
9
Res.
Res.
Res.
rw
24
23
22
Res.
Res.
Res.
8
7
6
Res.
w
w
for a description of how to unlock RTC register write
24
23
22
Res.
Res.
Res.
8
7
6
rw
rw
rw
RM0453 Rev 5
21
20
19
18
Res.
Res.
Res.
Res.
5
4
3
2
KEY[7:0]
w
w
w
w
RTC register
21
20
19
18
Res.
Res.
Res.
Res.
5
4
3
2
CALM[8:0]
rw
rw
rw
rw
RM0453
17
16
Res.
Res.
1
0
w
w
17
16
Res.
Res.
1
0
rw
rw
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