ZSWR5_TXCRC_ENABLE
zspp->wr5 = (uchar_t)(ZSWR5_TX_8 | ZSWR5_DTR | ZSWR5_TXCRC_ENABLE);
SCC_WRITE(5, (ZSWR5_TX_8 | ZSWR5_DTR | ZSWR5_TXCRC_ENABLE));
SCC_BIC(5, (ZSWR5_DTR | ZSWR5_RTS | ZSWR5_TXCRC_ENABLE));