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'[PIC]: Strange programmer function'
2001\07\09@084416 by btbromilow

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Hi all,

Can anyone think of an explanation for this??
My NOPPP programmer will not program 16F877s yet I know the design has been
used to do so by others.
I've programmed 16F84(A)s okay so I now the programmer works. I've checked
and double checked the 18-pin to 40-pin adapter and all the wires are going
to the correct pins.
When I test the voltages with the chip out of the circuit I get a nice 5v
supply.
When I put the chip in place the power supply shuts down. The power supply
can do 1A so I don't think it's just that the supply needed is higher than a
16F84 (which I've succesfully programmed!).
The chips are brand new. Is there anything that would cause a 16F877 to short
out.  I've tested two chips and they are both the same...

Ben

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2001\07\09@092745 by Benjamin Bromilow

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Hi all,

Forget the last post. I had an intermitent contact on the VDD leg of the
16F877. Still very strange though. I can write, read and verify perfectly on
16F84s but 16F877s won't work.
It will now let me program the chip but when I read it, it appears to have
filled everything with '000'. At least its a change from '3FF'. Also I can
only program the chip if I erase it first. Perhaps code protection is being
activated?? It sure shouldn't be.....
I think I might build a Tait parallel port programmer. At least then I'll be
able to use MP-LAB and program simultaneoulsy rather than doing a
Windows/Linux switch everytime....

Ben

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2001\07\09@092945 by James Paul

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Ben,

This may seem obvious, but are you putting them in the programmer
in the correct orientation?   I know I've put parts in backwards
before and swore I had them in correctly.  Just a thought.

                                         Regards,

                                           Jim


On Sun, 08 July 2001, ben wrote:

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2001\07\09@105622 by Morgan Olsson

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Strange. Test:

1) Without putting the Chip in any socket, use a multimeter and measure resistance between Vss and Vdd.

2)Put the chip in the socket and without powering up and disconnected from computer measure again.

Note: theese chips have double supply pins, you hve not by chance crossed them?

/Morgan


Tack för ditt meddelande 14:40 2001-07-08 enligt nedan:
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2001\07\09@110907 by Dale Botkin

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On Sun, 8 Jul 2001, Benjamin Bromilow wrote:

> It will now let me program the chip but when I read it, it appears to have
> filled everything with '000'. At least its a change from '3FF'. Also I can
> only program the chip if I erase it first. Perhaps code protection is being
> activated?? It sure shouldn't be.....

Sure sounds like it.  Take a look at the config bits in the hex file.  I
seem to recall a hex file intended for an 'F84 will turn on CP if you use
it unaltered on an 'F877, but I could be wrong.

Dale
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On my desk I have a workstation...

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2001\07\09@123027 by Benjamin Bromilow

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Hi all,

Found the problem. It appears I had a loose connection on the IC socket I
was using. It was an intermitent problem whereby if an IC pin was in the
socket a large amount of pressure was needed to make the connection.
Strangely, if there was not pin in the socket the connection was fine. Hence
getting 5v from the socket with no pin in place but 0.5v if it is
(presumably voltage coming through to VDD pin through the PIC- ouch!).
I found eventually that pressing hard down onto the top of the PIC sorted
it, but I'm off to buy a ZIP socket now to sort it out once and for all.
That particular PIC is resigned to R+D now, what with VDD sourcing
voltage(!) and being pushed around.
The second problem I encountered was that I had set the code protect bit
during programming (how stupid am I?). This meant I read 0000 for all the
program data segments. I assumed there would be some kind of warning from
the program if you tried to read a code protected chip. Oh well.
So all sorted at last!

Ben

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2001\07\09@140359 by James Paul

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Ben,

Just an FYI... The socket you are looking for is actually a ZIF
socket, not ZIP.   ZIF stands for Zero Insertion Force.  Thought
you might like to know.

                                            Regards,

                                              Jim






On Sun, 08 July 2001, Benjamin Bromilow wrote:

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