ST STM32F40 Series User Manual

RM0090 Real-time clock (RTC)
Doc ID 018909 Rev 4 662/1422
23.6.20 RTC backup registers (RTC_BKPxR)
Address offset: 0x50 to 0x9C
Power-on reset value: 0x0000 0000
System reset: not affected
23.6.21 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.
Table 99. 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
Reserved
PM
HT
[1:0]
HU[3:0]
Reserved
MNT[2:0] MNU[3:0]
Reserved
ST[2:0] SU[3:0]
Reset value 0000000 0000000 0000000
0x04
RTC_DR
Reserved
YT[3:0] YU[3:0] WDU[2:0]
MT
MU[3:0]
Reserved
DT
[1:0]
DU[3:0]
Reset value 00100001 000001
0x08
RTC_CR
Reserved
COE
OSEL
[1:0]
POL
COSEL
BKP
SUB1H
ADD1H
TSIE
WUTIE
ALRBIE ALRAIE
TSE
WUTE
ALRBIE
ALRAE
DCE
FMT
BYPSHAD
REFCKON
TSEDGE
WCKSEL
[2:0]
Reset value 000000000000000000000000
0x0C
RTC_ISR
Reserved
TA MP 2F TA MP 1F
TSOVF
TSF
WUTF
ALRBF ALRAF
INIT
INITF
RSF
INITS
SHPF
WUTWF
ALRBWF
ALRAWF
Reset value 000000000000101
0x10
RTC_PRER
Reserved
PREDIV_A[6:0]
Reserved
PREDIV_S[14:0]
Reset value 1111111 000000011111111
0x14
RTC_WUTR
Reserved
WUT[15:0]
Reset value 1111111111111111
0x18
RTC_CALIBR
Reserved
DCS
Reserved
DC[4:0]
Reset value 0 00000
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

ST STM32F40 Series Specifications

General

Brand	ST
Model	STM32F40 Series
Category	Microcontrollers
Language	English