Setting ADCON1 to 6 makes the AN0, 1, and 4 inputs active as analog 
rather than digital. It also makes AN2's pin Vref- and AN3 Vref+. These 
are respectively Port A pins 0, 1, 5, 2, and 3. Port E would be all 
digital in this case. I think they typo'ed and meant ";Load value to 
make ports A analog & E digital I/O".

If you wanted to make Ports A and E all analog inputs, you would use a 
value of 0, not 6. Then, AN0-AN7 would be all analog inputs. These are 
on Port A pins 0/1/2/3/5 and Port E pins 0/1/2.

Details on the PIC16F87xA datasheet page 128 (DS39582B). (Chapter 11)

Joe M.

Joseph Bento wrote:
> I'm looking at Table 4-2 (page 43) in the 16F877A datasheet. I am apparently 
> missing something in understing WHY 0x06 is used, and what I would choose if 
> I wanted an analog I/O.  What configuration chart am I overlooking that 
> describes the settings?
> 
> This is a portion of my code: (I apologize ahead of time for any formatting 
> issues.)
> 
> start   bsf    STATUS,RP0                 ;Switch to Bank1 for ADCON1
>           bcf   STATUS,RP1                 ;Make sure in Bank1
>           movlw 0x06                             ;Load value to make ports A 
> & E digital I/O
>           movwf ADCON1                    ;as opposed to Analog inputs
> 
> Thanks for any clarification anyone can offer.
> 
> Joe
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