CD1400_RDSR
line_stat = cd_read_reg(cy, CD1400_RDSR);
recv_data = cd_read_reg(cy, CD1400_RDSR);
cd_read_reg(cy, CD1400_RDSR);
CD1400_RDSR); /* data byte */
*mbpp->mp_ptr = CD1400_READ_REG(cd, CD1400_RDSR);
line_stat = CD1400_READ_REG(cd, CD1400_RDSR);
*ptr++ = CD1400_READ_REG(cd, CD1400_RDSR);