IUU_ONE_STOP_BIT
buf[3] = (u8) (0x0F0 & IUU_ONE_STOP_BIT) | (0x07 & IUU_PARITY_EVEN);
case IUU_ONE_STOP_BIT:
dataout[DataCount - 1] |= IUU_ONE_STOP_BIT;
parity |= (cflag & CSTOPB ? IUU_TWO_STOP_BITS : IUU_ONE_STOP_BIT);