Up till now I've been "used to" setting up the analog channels by defining what pins are analog and digital, in ADCONx register.  The 16F677 is different from what I can tell as you "define" the analog pin in ADCON0 when you go to read the input. ?
   
  Doesn't let you dual define pins that way either.
   
  Am I interpreting the data sheet correctly?

 		
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