ST STM32WL55JC

RM0453 Rev 2 991/1454
RM0453 Real-time clock (RTC)
1049
32.3 RTC functional description
32.3.1 RTC block diagram
Figure 273. RTC block diagram
MSv43841V3
rtc_alrb_trg
Alarm A
RTC_ALRMAR
RTC_ALRMASSR
RTC_ALRMABINR
Alarm B
RTC_ALRMBR
RTC_ALRMBSSR
RTC_ALRMBBINR
=
=
rtc_wut_trg
rtc_alra_trg
16-bit wakeup
auto reload timer
RTC_WUTR
Shadow
registers
RTC_TR,
RTC_DR
Output
control
RTC_OUT1
RTC_OUT2
TAMP
TAMPOE
Shadow register
RTC_SSR
Calendar
Synchronous
prescaler
(default = 256)
RTC_PRER
CALIB
OSEL[1:0]
ck_apre
(default 256 Hz)
TAMPALARM
ALARM
rtc_tamp_evt
RTC_REFIN
RTC_TS
Time stamp registers
RTC_TSTR
RTC_TSDR
RTC_TSSR
Time stamp detection
rtc_its
rtc_ker_ck
ck_spre
(default 1 Hz)
Prescaler
2, 4, 8, 16
WUCKSEL[1:0]
TSF
rtc_calovf
ck_apre clock domain
ck_wut clock domain
=0
WUTF
ALRAF
ALRBF
rtc_pclk clock domain
Registers interface
IRQ interface
rtc_it
ck_wut
rtc_ker_ck clock domain
Smooth
calibration
RTC_CALR
=0
SSRUF
Asynchronous
prescaler
(default = 128)
RTC_PRER
rtc_pclk