In a message dated 9/21/99 3:21:44 PM Eastern Daylight Time,
davidw2@MORGAN.UCS.MUN.CA writes:

> Hello all!
>
>  I'm using a PIC16F877 and the RA4 pin is driving me nuts.  Here's the
>  test code I'm trying to run:
>
>  TRISA4 = LOW;    //Set the A4 pin to output
>
>  while(1){
>      RA4 = HIGH;
>      DELAY();       //This is a 1 usec delay here
>      RA4 = LOW;
>  }
>
>  Pretty simple eh?  Now I've set PORT A and E to digital (by setting those
>  PCFG bits (but I've noticed in the data sheets that RA4 cannot be set to
>  digitial I/O using PCFG).  I think my RA4 is still analog output but I
>  want digital and I don't know how to do it (this is just my guess).
>
>  Cheers,
>  Dave
>
Isn't it open collector?  If so, you need a pull-up resistor.

Max