RM0091 Real-time clock (RTC)
Doc ID 018940 Rev 1 569/742
24.6.16 RTC backup registers (RTC_BKPxR)
Address offset: 0x50 to 0x60
Power-on reset value: 0x0000 0000
System reset: not affected
24.6.17 RTC register map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
BKP[31:16]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
BKP[15:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw w rw rw
Bits 31:0 BKP[31:0]
The application can write or read data to and from these registers.
They are powered-on by V
BAT
when V
DD
is switched off, so that they are not reset by
System reset, and their contents remain valid when the device operates in low-power mode.
This register is reset on a tamper detection event, as long as TAMPxF=1. or when the Flash
readout protection is disabled.
Table 82. RTC register map and reset values
Offset Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
RTC_TR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
PM
HT
[1:0]
HU[3:0]
Res.
MNT[2:0] MNU[3:0]
Res.
ST[2:0] SU[3:0]
Reset value 0000000 0000000 0000000
0x04
RTC_DR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
YT[3:0] YU[3:0] WDU[2:0]
MT
MU[3:0]
Res.
Res.
DT
[1:0]
DU[3:0]
Reset value 0000000000100001 000001
0x08
RTC_CR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
COE
OSEL
[1:0]
POL
COSEL
BKP
SUB1H
ADD1H
TSIE
Res.
Res.
ALRAIE
TSE
Res.
Res.
ALRAE
Res.
FMT
BYPSHAD
REFCKON
TSEDGE
Res.
Reset value 0000 0000 00 0 0000
0x0C
RTC_ISR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
TA MP 3F
.TA MP 2F
TA MP 1F
TSOVF
TSF
Res.
Res.
ALRAF
INIT
INITF
RSF
INITS
SHPF
Res.
Res.
ALRAWF
Reset value 0000 000000 1
0x10
RTC_PRER
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
PREDIV_A[6:0] PREDIV_S[14:0]
Reset value 11111110000000011111111
0x1C
RTC_ALRMAR
MSK4
WDSEL
DT
[1:0]
DU[3:0]
MSK3
PM
HT
[1:0]
HU[3:0]
MSK2
MNT[2:0] MNU[3:0]
MSK1
ST[2:0] SU[3:0]
Reset value 00000000000000000000000000000000
0x24
RTC_WPR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
KEY
Reset value 00000000
0x28
RTC_SSR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
SS[15:0]
Reset value 0000000000000000
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