UARTn_CTRL
u8 control = mps2_uart_read8(port, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);
u8 control = mps2_uart_read8(port, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);
u8 control = mps2_uart_read8(port, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);
u8 control = mps2_uart_read8(port, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);
u8 control = mps2_uart_read8(port, UARTn_CTRL);
mps2_uart_write8(port, control, UARTn_CTRL);