pub type RTCSEL_W<'a, const O: u8> = FieldWriterSafe<'a, u32, BDCR_SPEC, u8, RTCSEL_A, 2, O>;
Field RTCSEL writer - RTC clock source selection
RTCSEL
No clock
LSE oscillator clock selected
LSI oscillator clock selected
HSE oscillator clock divided by 32 selected