ST STM32L4+ Series Reference Manual page 1593

RM0432
47.3.2 RTC pins and internal signals
Pin name
RTC_TS
RTC_REFIN
RTC_OUT1
RTC_OUT2
• RTC_OUT1 and RTC_OUT2 which selects one of the following two outputs:
–
–
ALARM is enabled by configuring the OSEL[1:0] bits in the RTC_CR register which select
the alarm A, alarm B or wakeup outputs. TAMP is enabled by setting the TAMPOE bit in the
RTC_CR register which selects the tamper event outputs.
Internal signal name
rtc_ker_ck
rtc_pclk
rtc_its
rtc_tamp_evt
rtc_it
rtc_alra_trg
rtc_alrb_trg
rtc_wut_trg
The RTC kernel clock is usually the LSE at 32.768 kHz although it is possible to select other
clock sources in the RCC (refer to RCC for more details). Some functions are not available
in some low-power modes or V
Section 47.4: RTC low-power modes
Signal name
rtc_its
rtc_tamp_evt
Real-time clock (RTC) applied to STM32L4P5xx and STM32L4Q5xx only
Table 318. RTC input/output pins
Input
Input
Output
Output
CALIB: 512 Hz or 1 Hz clock output (with an LSE frequency of 32.768 kHz). This
output is enabled by setting the COE bit in the RTC_CR register.
TAMPALRM: This output is the OR between TAMP and ALARM outputs.
Table 319. RTC internal input/output signals
Input
Input
Input
Input
Output
Output
Output
Output
Table 320. RTC interconnection
From power controller (PWR): main power loss/switch to V
output
From TAMP peripheral: tamp_evt
Signal type
RTC timestamp input
RTC 50 or 60 Hz reference clock input
RTC output 1
RTC output 2
Signal type
RTC kernel clock, also named RTCCLK in
this document
RTC APB clock
RTC internal timestamp event
Tamper event (external) detected in TAMP
peripheral
RTC interrupts (refer to
interrupts
RTC alarm A event detection trigger
RTC alarm B event detection trigger
RTC wakeup timer event detection trigger
when the selected clock is not LSE. Refer to
BAT
for more details.
Source/destination
RM0432 Rev 6
Description
Description
Section 47.5: RTC
for details)
BAT
detection
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