> I think I will go with the 684

It could be worth going to the 18F, unless you already have the
684. I have a few 16F in the parts drawer but seldom use them
for new projects. The 18F1220, 1320 or similar are OK starters

http://ww1.microchip.com/downloads/en/DeviceDoc/39605F.pdf

They are a little more expensive but save you more than a dollar's
worth of programming time and effort

Joe
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