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'How to tell if PIC is in the socket'
1998\07\08@095337 by Ivan Cenov

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Hi,

I am developing my PIC programmer.
Here is my question:

How to tell if there is a PIC in programming socket ?
Or is it possible thing ?

Well, I can try programming, then verify, see
the difference and stop. But I have counters for
passed and failed PICs and do not wish to count
missing PIC as failed to program PIC.

Ivan Cenov
spam_OUTokto7TakeThisOuTspambotev.ttm.bg
http://www.geocities.com/SiliconValley/Network/9276/

1998\07\08@110928 by Peter L. Peres

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On Wed, 8 Jul 1998, Ivan Cenov wrote:

> Hi,
>
> I am developing my PIC programmer.
> Here is my question:
>
> How to tell if there is a PIC in programming socket ?
> Or is it possible thing ?
>
> Well, I can try programming, then verify, see
> the difference and stop. But I have counters for
> passed and failed PICs and do not wish to count
> missing PIC as failed to program PIC.
>
> Ivan Cenov
> .....okto7KILLspamspam@spam@botev.ttm.bg
> http://www.geocities.com/SiliconValley/Network/9276/

Been there. If you need it for serial programming, provide a weak pull
down resistor directly at the data pin on the socket. If an erased PIC is
inserted, verify will work as expected, else you read all 0's and either
the PIC's not there or it is all 0'd, which is about the same thing.

Peter

1998\07\09@072534 by Caisson

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> Van: Ivan Cenov <okto7spamKILLspamBOTEV.TTM.BG>
> Aan: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
> Onderwerp: How to tell if PIC is in the socket
> Datum: woensdag 8 juli 1998 15:05
>
> Hi,
>
> I am developing my PIC programmer.
> Here is my question:
>
> How to tell if there is a PIC in programming socket ?
> Or is it possible thing ?
>
> Well, I can try programming, then verify, see
> the difference and stop. But I have counters for
> passed and failed PICs and do not wish to count
> missing PIC as failed to program PIC.

You could try to pull the Clock-input (OSC1) high, and see if the
Clock-output (OSC2) went Low.  Maybe even toggle the input  & see if the
output changes with it.

Greetz,
 Rudy Wieser

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