On Wed, 5 Jun 1996, Troy Nelson wrote:

> Finally - if someone is using the 16C71 and has a simple program (like
> blinking an LED) they would email - I would sure appreciate it.  I'm
> trying to get an LED to blink and finding the process humbling.  My
> program is only about 20 lines long - so including it in the email

Hi,
        Like you I'm just starting out on using these 'wonderful' PIC
Chips, and also started off using the 16C71 to blink an LED and, yes you've
guessed it, It didn't work either. Well after hours of looking through the
data sheets and nearly throwing the whole thing in the bin, I found the
answer(I think).
        Because the 16C71 has the A/D on board, it uses the port pins as
inputs, so you have to tell it to use them as digital I/O, As far as I
can tell you do this by accessing register 88H as follows.

        BSF     3H,5H           ;Select page
        MOVLW   B'00000011'     ;Set bits for digital I/O
        MOVWF   88H             ;Set register
        BCF     3H,5H

        I've tried this code in my program and it seems to work. Hope
this helps a little bit, and good luck with future programs, I think we
may both need it.

Cheers
        Steve.