CFCLR_RDRFC
#define RSCI_RDxF_CLEAR (CFCLR_RDRFC)
#define CFCLR_CLRFLAG (CFCLR_RDRFC | CFCLR_FERC | CFCLR_PERC | \
rsci_serial_out(port, CFCLR, CFCLR_RDRFC);