SC16IS7XX_MCR_TCRTLR_BIT
SC16IS7XX_MCR_TCRTLR_BIT,
SC16IS7XX_MCR_TCRTLR_BIT);
sc16is7xx_port_update(port, SC16IS7XX_MCR_REG, SC16IS7XX_MCR_TCRTLR_BIT, 0);