UART_SCCM_TX
clrbits16(&sccp->scc_sccm, UART_SCCM_TX);
clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
if (in_be16(&sccp->scc_sccm) & UART_SCCM_TX)
setbits16(&sccp->scc_sccm, UART_SCCM_TX);
if (events & UART_SCCM_TX)
clrbits16(&sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);