pub type SW_W<'a, const O: u8> = FieldWriterSafe<'a, u32, CFGR_SPEC, u8, SW_A, 2, O>;
Field SW writer - System clock switch
SW
MSI oscillator used as system clock
HSI16 oscillator used as system clock
HSE32 oscillator used as system clock
PLLRCLK used as system clock