HSI16 clock selected as PLL entry clock source
HSE clock selected as PLL entry clock source
PLL Spread Spectrum Selection
LL_RCC_SPREAD_SELECT_CENTER
PLL center spread spectrum selection
LL_RCC_SPREAD_SELECT_DOWN
PLL down spread spectrum selection
RTC clock source selection
LL_RCC_RTC_CLKSOURCE_NONE
No clock used as RTC clock
LSE oscillator clock used as RTC clock
LSI oscillator clock used as RTC clock
HSE oscillator clock divided by HSE prescaler
used as RTC clock
HSE prescaler for RTC clock