pub type CKSEL_W<'a, const O: u8> = BitWriter<'a, u32, CFGR_SPEC, CKSEL_A, O>;
Field CKSEL writer - CKSEL
CKSEL
LPTIM is clocked by internal clock source (APB clock or any of the embedded oscillators)
LPTIM is clocked by an external clock source through the LPTIM external Input1