[oopic] How can I read an external A2D on the OOPic-R?

Does anyone have any experience attaching an external A2D to the
OOPic? I need some more resolution that the 10-bit on board A2D and
would like to hookup a 12-bit to the OOPic. I just need a little
direction to get started. If I can hook it to the I/O pins how does
the OOPic interpret the digital information? Any help would be a
appreciated, thanks.

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