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'[PIC]: FPP programming 16LF84 fails sometimes on D'
2002\10\07@205502 by Paul Gaastra

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We have a Warp13a programmer which programs our little PIC16LF84 circuit
beautifully.

However we want to put a serial number on each device to we try to use
David Tait's FPP program with a programmer designed by someone who left
the company.  I am trying to find out why on about 1/3 of the boards the
programming fails on the Data EEprom.  Anybody got any clues?

I see on the scope that the Warp13a has heaps of "rest" between each
write but toggles the clock at a faster rate (100kHz) than the FPP
(32kHz)

I would have gone onto the Forum that I used to solve previous problems
(the pluto.beseen.com/boardroom .... ) but that has gone off line.




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2002\10\11@164340 by Bernard Boudet

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Hi Paul,

On Tue, 8 Oct 2002 13:43:48 +1300 you wrote:

> We have a Warp13a programmer which programs our little PIC16LF84 circuit
> beautifully.
>
> However we want to put a serial number on each device to we try to use
> David Tait's FPP program with a programmer designed by someone who left
> the company.  I am trying to find out why on about 1/3 of the boards the
> programming fails on the Data EEprom.  Anybody got any clues?

You could try my programmer, which works with FPP and should let you
flash the chips in-circuit.

A zip file, with the schematic, FPP settings, and my notes is
here: http://www.foobar.clara.net/bboudet/yapp/yapp.zip

> I see on the scope that the Warp13a has heaps of "rest" between each
> write but toggles the clock at a faster rate (100kHz) than the FPP
> (32kHz)

FPP has settings for the programmer timings.  It could simply be they
got changed somehow.

HTH,
-bernie.

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