Did you set the port to analog?
But even more impotantly, did you set the port to imput?  That should do
it.

> I am trying to use a 16C73 to measure a voltage in the range 0-5v and am
> having zero luck.  I'm using the CCS compiler; to set up the port, I'm
> writing 0x41 to $1F and 0x00 to $9F; the CPU runs at 3.579545MHz.
>
> All of the readings, obtained via the code:
>
>         bsf     $1F,2
> ZZZ:
>         btfsc   $1F,2
>          goto   ZZZ
>         movf    $1E,w
>         movwf   Value
>
> Are coming out $FF, independent of the input voltage.  Is there something
I'm
> missing here?