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PICList Thread
'Code protect and the 16C74/JW'
1996\06\10@230025 by Robert Ct

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I am relatively new to the work of PIC and after having played around with
the 16c84 successfully, I decided to try my hand at the 16C74/JW.  Last
night, while trying out Bojan Dobaj shareware programmer, I selected Code
Protect ON - from 0400h to 0fffh  by accident and realized after erasing the
chip that that I could not get any memory pass the 03FF mark to revert to 3FFF.

Please someone tell me how I can get it back!!! (I have paid good money for
this chip and have not had a chance to use it once yet)  I have read the
datasheet 15 times over to find a way to recover for my mistake but to no
avail...

Remembering that Jim Robertson (Newfound Electronics) had mentioned
something about code protect, I went back to his note that warns about this
but only for the A device, no mention of the plain C74...

Can anyone help?

1996\06\11@020424 by fastfwd

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Robert Cote, <spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU> wrote:

> I decided to try my hand at the 16C74/JW.  Last night, while trying
> out Bojan Dobaj shareware programmer, I selected Code Protect ON -
> from 0400h to 0fffh  by accident and realized after erasing the
> chip that that I could not get any memory pass the 03FF mark to
> revert to 3FFF.
>
> Please someone tell me how I can get it back!!!
> ....
> Remembering that Jim Robertson (Newfound Electronics) had mentioned
> something about code protect, I went back to his note that warns
> about this but only for the A device, no mention of the plain C74...

Robert:

If your 16C74 is not an "A" part, you simple need to put it back in
the eraser for another cycle (or two, or three, or four); the
code-protect bit (by design) takes a long time to erase.

-Andy

Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
Fast Forward Engineering, Vista, California
http://www.geocities.com/SiliconValley/2499

1996\06\11@101234 by Bojan Dobaj

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>I am relatively new to the work of PIC and after having played around with
>the 16c84 successfully, I decided to try my hand at the 16C74/JW.  Last
>night, while trying out Bojan Dobaj shareware programmer, I selected Code
>Protect ON - from 0400h to 0fffh  by accident and realized after erasing the
>chip that that I could not get any memory pass the 03FF mark to revert to 3FFF.
>
>Please someone tell me how I can get it back!!! (I have paid good money for
>this chip and have not had a chance to use it once yet)  I have read the
>datasheet 15 times over to find a way to recover for my mistake but to no
>avail...
>
>Remembering that Jim Robertson (Newfound Electronics) had mentioned
>something about code protect, I went back to his note that warns about this
>but only for the A device, no mention of the plain C74...
>
>Can anyone help?
>

P16Pro programmer, you tryed out, displeys the warning message when you try
to programm newer PICs (included 74) with code protect ON. In README.TXT
delivered with P16PRO is also a warning about that. I have included it because
I had a similar problem.

But what is done is done. You can try to put your PIC back in the eraser for
a longer time (up to 36 hours) and hope.


Bojan Dobaj, Slovenia
bojan.dobajspamKILLspamuni-mb.si

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