Rtc Pins And Internal Signals; Table 146. Rtc Input/Output Pins; Table 147. Rtc Internal Input/Output Signals - ST STM32G0 1 Series Reference Manual

RM0444
30.3.2

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
rtc_calovf
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 30.4: RTC low-power modes

Table 146. 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 147. RTC internal input/output signals

Input
Input
Input
Input
Output
Output
Output
Output
Output
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 (internal or 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
RTC calendar overflow
when the selected clock is not LSE. Refer to
BAT
for more details.
RM0444 Rev 5
Real-time clock (RTC)
Description
Description
Section 30.5: RTC
for details)
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