UART_CTRL_TE
cr | UART_CTRL_RE | UART_CTRL_TE |
cr & ~(UART_CTRL_RE | UART_CTRL_TE |
UART_PUT_CTRL(port, ctrl | UART_CTRL_TE);
UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE));
if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) {