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I want to read either PortA or PortE on a 16F877 chip as digital input.

I have read the PortA, PortE, and A/D sections of 30292c.pdf
In particular, I have read p113.
On page 218, there is an example to use PortA.  I have not done the
CLRF PortA shown in the example, but otherwise comply.  I will try this in
the next cycle.

I have set ADCON1 to 0x06 and verified this with read and display to LEDs.
I have set  and verified TRISA to 0x3F

I do a very simple
         banksel PORTA
         movf    PORTA,w
         banksel PORTD           ;home of the LEDs.
         movwf   PORTD

The LEDs are always dark.  I have success with PORTC as an input.

Thoughts?


- --
Aubrey McIntosh, Ph.D.


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