DocID024597 Rev 3 1105/1693
RM0351 Real-time clock (RTC)
1106
34.6.21 RTC register map
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 174. 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 0000000000 100001 000001
0x08
RTC_CR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
ITSE
COE
OSE
L
[1:0]
POL
COSEL
BKP
SUB1H
ADD1H
TSIE
WUTIE
ALRBIE
ALRAIE
TSE
WUTE
ALRBE
ALRAE
Res.
FMT
BYPSHAD
REFCKON
TSEDGE
WUCKS
EL[2:0]
Reset value 00000 00000000000 0000000
0x0C
RTC_ISR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
ITSF
RECALPF
TAMP3F
.TAMP2F
TAMP1F
TSOVF
TSF
WUTF
ALRBF
ALRAF
INIT
INITF
RSF
INITS
SHPF
WUT WF
ALRBWF
ALRAWF
Reset value 00 000000000000111
0x10
RTC_PRER
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
PREDIV_A[6:0] PREDIV_S[14:0]
Reset value 11111110000000011111111
0x14
RTC_WUTR
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
WUT[15:0]
Reset value 1111111111111111
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
0x20
RTC_ALRMBR
MSK4
WDSEL
DT
[1:0]
DU[3:0]
MSK3
PM
HT
[1:0]
HU[3:0]
MSK2
MNT[2:0] MNU[3:0]
MSK2
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
0x2C
RTC_SHIFTR
ADD1S
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.
SUBFS[14:0]
Reset value 0 000000000000000
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