d>The output of the transmitter (It is also the output of the mux that selects between start, serial data, parity, or stop bits according to the state of the transmission).</td>
    </tr>
    <tr>
        <td>busy</td>
        <td>output</td>
        <td align="center">1</td>
        <td>A signal that indicates that the transmitter is currently in operation and it can't transmit new data.</td>
    </tr>
</table>
<h4 id="uart-transmitter-finite-state-machine-fsm">UART Transmitter Finite State Machine (FSM)</