parameter can be one of the following values:
RCC_LSE_OFF: turn OFF the LSE oscillator,
LSERDY flag goes low after 6 LSE oscillator clock
cycles.
RCC_LSE_ON: turn ON the LSE oscillator.
RCC_LSE_BYPASS: LSE oscillator bypassed
with external clock.
Notes:
Transition LSE Bypass to LSE On and LSE On to LSE
Bypass are not supported by this macro. User should
request a transition to LSE Off first and then LSE On or
LSE Bypass. As the LSE is in the Backup domain and
write access is denied to this domain after reset, you
have to enable write access using
HAL_PWR_EnableBkUpAccess() function before to
configure the LSE (to be done once after reset). After
enabling the LSE (RCC_LSE_ON or
RCC_LSE_BYPASS), the application software should
wait on LSERDY flag to be set indicating that LSE
clock is stable and can be used to clock the RTC.
Notes:
After enabling the LSI, the application software should
wait on LSIRDY flag to be set indicating that LSI clock
is stable and can be used to clock the IWDG and/or the
RTC. LSI can not be disabled if the IWDG is running.
When the LSI is stopped, LSIRDY flag goes low after 6
LSI oscillator clock cycles.
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