SCIF_TDFE
#define SCIF_TDxE_CLEAR (u32)(~(SCIF_TDFE))
#define SCxSR_TDxE(port) (((port)->type == PORT_SCI) ? SCI_TDRE : SCIF_TDFE)
.poll_sent_bits = SCIF_TDFE | SCIF_TEND