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PICList Thread
'Strange behaviour on PIC insertion'
1998\09\03@065933 by netquake

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Hello everybody!
Not long ago I posted some information to let anybody help my debug
my PIC programmer. Now I've collected some extra info on my problem:
inability to 'burn' a PIC (16F84-04 in this case)
I've found David Tait's PP.EXE debug mode very useful to test the
programmer (which uses a combination of two ICs to handle programming:
74LS06 buffer/inverter to drive printer port lines and 4066B to drive
voltage)
The program runs smoothly when the PIC is NOT inserted. LOW logic states
are not higher than 0.7V (which seems OK) and HIGH logic states are 5.0V
plain
(measuring Vdd, RB6 and RB7 relative to GND pin 5). Vpp is 0.2V LOW and 12V
HIGH.  They all trigger just fine.
Everything's cool until I insert the PIC. Software now yields a nasty
'hardware fault' and the measurements above go nuts:
(PIC inserted)
Vdd ON : Vdd raises from 0.00V to 0.20V
Vpp ON : Vpp/MCLR raises from 0.05V to 12.5V
Clock HIGH: RB6 raises from 0.08V to 0.62V
Data HIGH: RB7 raises from 0.08V to 0.62V
Triggering is fine.

What's going on!?! (Has anybody seen this before?)
(I haven't tested another chip yet.)
Thank you all. ;-)

P.D.: I would like to thank Bob Blick, Dennis Plunket, Dr. Imre Bartfai and
Paul B. Webster for their help.

--------------------------------------------------
"Hiroshima '45  Tsjernobyl '86 ... Windows '95"

 netQ
<spam_OUTnetquakeTakeThisOuTspaminnocent.com>

1998\09\03@191455 by Tony Nixon

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netQ wrote:
>  What's going on!?! (Has anybody seen this before?)
>  (I haven't tested another chip yet.)

Maybe that's your answer. Perhaps you damaged the chip while you were
testing the programmer.

If the programmer tests ok with the debug software and the voltages
appear correct, then I would try a new PIC.


--
Best regards

Tony

Multimedia 16F84 Beginners PIC Tools.
**New Improved PicNPost**

http://www.picnpoke.com
Email .....picnpokeKILLspamspam@spam@cdi.com.au

1998\09\04@034405 by netquake

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I'm on to it. Thanks.

P.D: How much is a 16F84 in your country?

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{Quote hidden}

1998\09\04@202218 by netquake

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Sorry, this wasn't intended for the list!

----------
>
> I'm on to it. Thanks.
>
> P.D: How much is a 16F84 in your country?
>

--------------------------------------------------
"Hiroshima '45  Tsjernobyl '86 ... Windows '95"

netQ
<netquakespamspam_OUTinnocent.com>

1998\09\07@051201 by Dr. Imre Bartfai

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On Fri, 4 Sep 1998, netQ wrote:

> I'm on to it. Thanks.
>
> P.D: How much is a 16F84 in your country?
>
About $4 - $5 + VAT

Imre

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