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'12c509/jw-!Programming Failed!'
1998\11\11@161928 by Eduardo R.

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Hi everybody;

 Trying to program 12C50X/JW the software responded with a warning message:

        ! Programming Error-Programming failed!.

This is not the same when trying one 16F84, with 'F84 everything is fine. I
am using   ITUPIC-1 programmer in both cases .

I was wondering if the EEprom based chips require any erase cicle before
first time programming .

Reading the 12C509 I found:

:10001000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F70
:10002000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F60

Reading the 16F84 (erased) is quite different:

:10001000FF3FFF3FFF3FFF3FFF3FFF3FFF3FFF3FF0
:10002000FF3FFF3FFF3FFF3FFF3FFF3FFF3FFF3FE0

Should I have the cells this way in order to be sure that my chip is erased?

thank you for your reply
.

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1998\11\11@161945 by Eduardo R.

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Hi;
I  mis-spelled  EEprom in my question, it should be *Eprom* instead,
referring to the UV erasing cicles:

> I was wondering if the EEprom based chips require any erase cicle before
first time programming .
>


>Hi everybody;
>
>  Trying to program 12C50X/JW the software responded with a warning message:
>
>         ! Programming Error-Programming failed!.
>
> This is not the same when trying one 16F84, with 'F84 everything is fine.
I am using   ITUPIC-1 programmer in both cases .
>
> I was wondering if the EEprom based chips require any erase cicle before
first time programming .
{Quote hidden}

1998\11\11@221756 by James Cameron

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Eduardo R. wrote:
> I was wondering if the Eprom based chips require any erase cycle
> before first time programming.

No.  But you should read and save the OSCCAL value at end of memory.

>  Reading the 12C509 I found:
> :10001000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F70
> :10002000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F60
>  Reading the 16F84 (erased) is quite different:
> :10001000FF3FFF3FFF3FFF3FFF3FFF3FFF3FFF3FF0
> :10002000FF3FFF3FFF3FFF3FFF3FFF3FFF3FFF3FE0

No, they are the same.  ;-)  12C509 is 12 bits wide, 16F84 is 14 bits
wide, so what you are seeing is an erased chip.

--
James Cameron                                      (.....cameronKILLspamspam@spam@stl.dec.com)

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