I think think the 628A will be easier for you, as long as you won't be needing the A/D module in the future. It doesn't have one. Would have been easier for me too, since I changed my previous post about 10 times.

But you'll need CMCON = 7 for it's analog pins.

However, like you suggested, you could use another pin and ANSEL = 0 and it should work fine with the 690. For now.
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