Hi.

When you erase the device before reprogramming, did you try to read back the
data to confirm that it's all erased?  If it doesn't erase, then maybe your
UV is not operating quite so well any more?

Also, if that PIC has been reprogrammed so many times, maybe the memory has
just worn out.  I know the flash parts are only good for 1000 Erase/Write
cycles, not sure about EPROM...

I can't figure out why you would get that error at 0091.  It does seem that
if you had a Vpp problem it would show up right away, unless of course
you're just making minor changes to the software...

Hope that helps, some.

- Wade
----- Original Message -----
From: "Reyes" <reyes@BELLSOUTH.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, August 26, 2001 4:10 PM
Subject: Re: [pic]: what does code error at 0000 mean?


> While attempting to program a 12c508 which has already been programmed, I
> get the same error, 'Code programming error at 0091'.  If Vpp is the
> problem, shouldnt it show up at 0000?  I can reprogram the same orignal
code
> with no problems.
>
> Thanks,
> Kevin R.
> ----- Original Message -----
> From: "Wade Carpenter" <wade@HOME.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Saturday, August 25, 2001 11:06 PM
> Subject: Re: [pic]: what does code error at 0000 mean?
>
>
> > Code error at 0000 means it is unable to modify the flash.  It tries to
> > write the first byte, verifies, and the verify fails.
> >
> > I'm fairly new to this as well, but here's what i think it might be:
> >
> > Are you using Low-Voltage programming or standard?
> >
> > If you are using low-voltage programming, maybe your RB3 pin and VPP are
> > going high at the wrong times / in the wrong sequence?
> >
> > If you are using standard programming, check that your VPP is actually
in
> > spec while you are trying to write to the chip.
> >
> > Also, is there any chance code protection was enabled?  This could cause
> the
> > error as well.
> >
> > - Wade
> > ----- Original Message -----
> > From: "rad0" <rden25@MINDSPRING.COM>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Friday, August 24, 2001 9:12 PM
> > Subject: [pic]: what does code error at 0000 mean?
> >
> >
> > > hello,
> > >
> > > trying to program a 16F877 using the EPIC programmer,
> > >
> > > I keep getting this message, 'code erroe at location 0000' what
> > > does this mean?  it will read and verify but the blink program
> > > example will not program.....
> > >
> > > I have the configuration set as follows
> > >
> > > XT
> > > off
> > > per up
> > > burn out
> > > flash
> > >
> > >
> > > thanks for your help
> > >
> > > --
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> > >
> >
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> >
> >
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>

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