====== portReverse ======

''void portReverse (u16 portNumber)''
|portNumber : The port number to toggle | 

Toggles the output state of the given port, portNumber.

<code c>
portOn(20);              // Turns port 20 on
portReverse(20);         // Turns port 20 off
portReverse(20);         // Turns port 20 back on
</code>

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