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'[PIC]: misterious problems when programming pics 1'
2001\01\31@172638 by joan ilari

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I would greatly appreciate that somebody could give a clue on a subject
that puzzles me :

I have an ITU pic programmer (parallel port) which works very nice when
programming 16C84 pics but which fails programming 16F84 pics. 16F84
pics are OK (I can program them with a serial programmer from a friend
of mine) and during a couple of days I even could program them in my ITU
programmer.

Now, when I try to program them and I read the 16F84 pics I get all 0s and
the
code protect bit set. The program does not run in my prototype board,
while the 16C84 version does (so, I guess that it is not a code protection
issue, but a bad programming one)

Do have the 16F84 and the 16C84 some difference from the programming
point of view which could explain this behaviour? The software I am using
is Picprg32 for WinNT (in a W2000 environment) from Nigel Goodwin.

Thanx for your attention

Joan Ilari

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2001\01\31@180932 by briang

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In-Reply-To: <.....AKECIHMGACMKNJCEIMAJOEEJCAAA.joan_ilariKILLspamspam@spam@eic.ictnet.es>

joan ilari <joan_ilarispamKILLspamEIC.ICTNET.ES> wrote:

{Quote hidden}

Yes the programming spec for the 16F84 is slightly different from that for
the 16C84. I think a bit in one of the commands is inverted or something.

Brian Gregory.
.....briangKILLspamspam.....cix.compulink.co.uk

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'[PIC]: misterious problems when programming pics 1'
2001\02\01@023103 by Russell McMahon
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> I have an ITU pic programmer (parallel port) which works very nice when
> programming 16C84 pics but which fails programming 16F84 pics. 16F84
> pics are OK (I can program them with a serial programmer from a friend
> of mine) and during a couple of days I even could program them in my ITU
> programmer.
>
> Now, when I try to program them and I read the 16F84 pics I get all 0s and
> the
> code protect bit set.


The biggest change between 16C84 and 16F84 is that the code protect bit is
INVERTED.
If programming a 16F84 in 16C84 mode you must set protect bit ON if you want
it off.

This does not appear to explain your total problem. but may be a factor.



regards


                   Russell McMahon

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2001\02\01@170904 by Tony Nixon

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Russell McMahon wrote:
>
> > I have an ITU pic programmer (parallel port) which works very nice when
> > programming 16C84 pics but which fails programming 16F84 pics. 16F84
> > pics are OK (I can program them with a serial programmer from a friend
> > of mine) and during a couple of days I even could program them in my ITU
> > programmer.
> >
> > Now, when I try to program them and I read the 16F84 pics I get all 0s and
> > the
> > code protect bit set.
>
> The biggest change between 16C84 and 16F84 is that the code protect bit is
> INVERTED.
> If programming a 16F84 in 16C84 mode you must set protect bit ON if you want
> it off.
>
> This does not appear to explain your total problem. but may be a factor.

It's the PWRTE bit that is inverted.

The code protection is a bit different also.

C84 only has 1 CP bit (bit 4)
F84 has bits 4 - 13 for CP bits


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Best regards

Tony

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2001\02\02@045239 by Clive Frederickson

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> I have an ITU pic programmer (parallel port) which works very nice when
> programming 16C84 pics but which fails programming 16F84 pics. 16F84
> pics are OK (I can program them with a serial programmer from a friend
> of mine) and during a couple of days I even could program them in my ITU
> programmer.
>
> Now, when I try to program them and I read the 16F84 pics I get all 0s and
> the
> code protect bit set.

I met this problem with a tait style programmer, I found that the 16F84 was
less tolerant of Vpp voltage variation. It should be 12v. at the Vpp pin.


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