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You would need at least 5 signals (4 for channel select and one for the I/O) and more for the enable or you can tie that high. You need to define your port for I/O that you want. Set your port for the channel you want select (0-15) and write your ABCD value to match the channel you want then either read the input or write the output. That is a very basic rushed explanation but it should get you started.
1.) Init function to define pins and ports
2.) Select channel by setting ABCD on the multiplexer
3.) Write/Read from the output port of the multiplexer
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