STMicroelectronics STM32WL5 Series Reference Manual page 990

Real-time clock (RTC)
32.3 RTC functional description
32.3.1 RTC block diagram
rtc_tamp_evt
rtc_its
RTC_TS
RTC_REFIN
rtc_ker_ck
WUCKSEL[1:0]
ck_wut
rtc_pclk
990/1450
Figure 274. RTC block diagram
RTC_PRER
Asynchronous
prescaler
(default = 128)
Prescaler
2, 4, 8, 16
RTC_WUTR
16-bit wakeup
auto reload timer
ck_wut clock domain
Alarm A
RTC_ALRMAR
RTC_ALRMASSR
RTC_ALRMABINR
Alarm B
RTC_ALRMBR
RTC_ALRMBSSR
RTC_ALRMBBINR
IRQ interface
Registers interface
Time stamp detection
Time stamp registers
RTC_TSTR
RTC_TSDR
RTC_TSSR
RTC_CALR RTC_PRER
Smooth Synchronous
calibration prescaler
(default = 256)
Shadow register
RTC_SSR
ck_apre
(default 256 Hz)
ck_apre clock domain
TAMP
TAMPOE
ALARM
WUTF
=0
ALRAF
=
ALRBF
=
SSRUF
=0
RM0453 Rev 5
TSF
ck_spre
(default 1 Hz)
Calendar
Shadow
registers
RTC_TR,
RTC_DR
CALIB
Output
TAMPALARM
control
OSEL[1:0]
rtc_ker_ck clock domain
rtc_pclk clock domain
RM0453
rtc_calovf
RTC_OUT1
RTC_OUT2
rtc_wut_trg
rtc_alra_trg
rtc_alrb_trg
rtc_it
MSv43841V3