UARTn_CTRL_RX_GRP
control &= ~UARTn_CTRL_RX_GRP;
control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP);
control |= UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP;
control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP);