Description:
Macros to configure the RTC clock
(RTCCLK).
Parameters:
__RTCCLKSource__: specifies the RTC
clock source. This parameter can be one of
the following values:
RCC_RTCCLKSOURCE_LSE: LSE
selected as RTC clock.
RCC_RTCCLKSOURCE_LSI: LSI
selected as RTC clock.
RCC_RTCCLKSOURCE_HSE_DIVx:
HSE clock divided by x selected as
RTC clock, where x:[2,31]
Notes:
As the RTC clock configuration bits are in
the Backup domain and write access is
denied to this domain after reset, you have
to enable write access using the Power
Backup Access macro before to configure
the RTC clock source (to be done once
after reset). Once the RTC clock is
configured it can't be changed unless the
Backup domain is reset using
__HAL_RCC_BackupReset_RELEASE()
macro, or by a Power On Reset (POR).
If the LSE or LSI is used as RTC clock
source, the RTC continues to work in STOP
and STANDBY modes, and can be used as
wake-up source. However, when the HSE
clock is used as RTC clock source, the
RTC cannot be used in STOP and
STANDBY modes. The maximum input
clock frequency for RTC is 1MHz (when
using HSE as RTC clock source).
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