I have serious doubts the program is even running on the 16F877a. My suspic=
ion is (as I have earlier stated) that not all the setup (including config =
register) has been done properly. Another possibility is that he has tried =
to program it as a 16F877 instead of a 16F877a, and they have different pro=
gramming algorithms.

If I am wrong in my above conclusions, then I suspect that it really is a R=
MW issue with the port, which the compiler masks on the 18F device because =
that has LAT registers that it will use when trying to bit twiddle the RA b=
its, where on the 16F it is working on the port bits themselves.


>=20
>  Have you tried just stopping the program after it runs one time instead =
of
> looping back to ".INIT"
>  It may be running so fast you can't see what is displayed before it rese=
ts
> itself.
>  Just a thought.
>=20
> Regards,
>=20
> Jim
>=20
> > -------- Original Message --------
> > Subject: Re: SV: SV: SV: SV: [PIC]: Trying to get a 16F877A to talk to
> > an LCD!
> > From: "Richard R. Pope" <mechanic_2@charter.net>
> > Date: Tue, October 20, 2015 11:46 am
> > To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> >
> >
> > Hello all,
> >      I have the LCD working. Well kind of any way. I didn't do it with
> > the 877. I used a 18F4550 which is pin compatible with the 16F877 and
> > it works. At least the display resets and I have a cursor on the screen=
..
> > Also for the one or two seconds that it takes for the program to run I
> > get a display on the scope. Yeah! But why not the 877?? Hum! I don't
> > know. It took me almost 12 hours to get here. I appreciate everybody's
> > help and I don't know how to explain this.
> > Thanks,
> > rich!
> >
> > On 10/20/2015 10:59 AM, Allen Mulvey wrote:
> > > I haven't been following this too closely but I don't see
> > > ADCON0 set in there.
> > >
> > > This is what I use:
> > >        ADCON0 =3D 0;                              // adc off
> > >        ADCON1 =3D 7;                              // all
> > > digital
> > >        CMCON =3D 7;                               //
> > > Comparators off
> > >
> > > Allen
> > >
> > >> -----Original Message-----
> > >> From: piclist-bounces@mit.edu [mailto:piclist- bounces@mit.edu] On
> > >> Behalf Of Richard R. Pope
> > >> Sent: Tuesday, October 20, 2015 11:45 AM
> > >> To: Microcontroller discussion list - Public.
> > >>
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>=20
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

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