Joe,
I think you're shifted 1 bit to the left due to the late hour :)
Mark

On 2/16/2010 11:43 PM, MCH wrote:
> 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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