Table 174. Rtc Register Map And Reset Values - ST STM32L4x6 Reference Manual

RM0351
Bits 31:0 BKP[31:0]
34.6.21 RTC register map
Offset Register
RTC_TR
0x00
Reset value
RTC_DR
0x04
Reset value
RTC_CR
0x08
Reset value
RTC_ISR
0x0C
Reset value
RTC_PRER
0x10
Reset value
RTC_WUTR
0x14
Reset value
RTC_ALRMAR
0x1C
Reset value 0
RTC_ALRMBR
0x20
Reset value 0
RTC_WPR
0x24
Reset value
RTC_SSR
0x28
Reset value
RTC_SHIFTR
0x2C
Reset value 0
The application can write or read data to and from these registers.
They are powered-on by V
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

0
0 0
DT
DU[3:0]
[1:0]
0 0 0 0 0 0 0 0
DT
DU[3:0]
[1:0]
0 0 0 0 0 0 0 0
DocID024597 Rev 3
when V is switched off, so that they are not reset by
BAT DD
HT
HU[3:0]
[1:0]
0 0 0 0 0 0 0
YT[3:0] YU[3:0] WDU[2:0]
0 0 0 0 0 0 0 0
OSE
L
[1:0]
0 0 0 0 0 0 0
0 0
PREDIV_A[6:0]
1 1 1 1 1 1 1 0
1
HT
HU[3:0]
[1:0]
0 0 0 0 0 0 0 0
HT
HU[3:0]
[1:0]
0 0 0 0 0 0 0 0
0
Real-time clock (RTC)
MNT[2:0] MNU[3:0]
0 0 0 0 0 0 0
MU[3:0]
0 1 0 0 0 0 1
0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
PREDIV_S[14:0]
0 0 0 0 0 0 0 1
WUT[15:0]
1 1 1 1 1 1 1 1
MNT[2:0] MNU[3:0]
0 0 0 0 0 0 0 0
MNT[2:0] MNU[3:0]
0 0 0 0 0 0 0 0
0
SS[15:0]
0 0 0 0 0 0 0 0
SUBFS[14:0]
0 0 0 0 0 0 0 0
ST[2:0] SU[3:0]
0 0 0 0 0 0 0
DT
DU[3:0]
[1:0]
0 0 0 0 0 1
WUCKS
EL[2:0]
0 0 0 0 0 0 0
0 0 0 0 1 1 1
1 1 1 1 1 1 1
1 1 1 1 1 1 1
ST[2:0] SU[3:0]
0 0 0 0 0 0 0
ST[2:0] SU[3:0]
0 0 0 0 0 0 0
KEY
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
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