pub type CKO_W<'a, const O: u8> = FieldWriter<'a, u32, TCMR_SPEC, u8, CKO_A, 3, O>;
Field CKO writer - Transmit Clock Output Mode Selection
CKO
None, TK pin is an input
Continuous Transmit Clock, TK pin is an output
Transmit Clock only during data transfers, TK pin is an output