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PICList Thread
'[PIC]: Code protection on 16C73B'
2000\06\21@004803 by Esteban Traid

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Hi,
I have a 16C73B I was playing with for some time, but now when I try to
program it and read it back it comes as all 00.
Any Ideas on what this can be?
May it be that I have (by error) set the code protection on? How would the
chip read if I had done so?
Any other ideas?
Thanks,

Esteban.

2000\06\21@005630 by Tony Nixon

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Esteban Traid wrote:
>
> Hi,
> I have a 16C73B I was playing with for some time, but now when I try to
> program it and read it back it comes as all 00.
> Any Ideas on what this can be?
> May it be that I have (by error) set the code protection on? How would the
> chip read if I had done so?
> Any other ideas?
> Thanks,
>
> Esteban.

It sounds like you have accidently code protected the device.

It will read 0000's when code protected.

--
Best regards

Tony

http://www.picnpoke.com
spam_OUTsalesTakeThisOuTspampicnpoke.com

2000\06\21@050950 by -1?Q?Martin_Sch=E4fer?=

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Thats exactly what you would read:

All zeros, if the Code Protect is set. And probably there is no chance to
reanimate this PIC.

Martin


;**********************************************
;**   name:      Martin Schaefer             **
;**   company:   elektronik 21 GmbH, Germany **
;**   e-mail:    .....schaeferKILLspamspam@spam@elektronik21.de    **
;**********************************************


> {Original Message removed}

2000\06\21@052441 by marius bratrein

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I have gotten similar error messages on my PIC programmer CP on and all
zeroes, but I have been able to use this PICs again after a heavy UV
shower :) I run double the amount of time that I normally  erase with.
These chips were 17c756 Ceramic Pckg
Go figure

Good luck

Marius


Martin Schäfer wrote:
>
> Thats exactly what you would read:
>
> All zeros, if the Code Protect is set. And probably there is no chance to
> reanimate this PIC.
>
> Martin

2000\06\26@090608 by Esteban Traid

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I have been experimenting with a 16C73B for a couple of weeks with no
problems and in the last few days I have ruined 2 of them by accidentally
code protecting them. The first time I thought it had been my mistake, but
then I has more carefull and the second one only lasted a couple of hours,
and I am completely sure about checking the code protection bits before
eache individual programming.
So I think this might have something to do with teh programmer (Ider HW or
SW) or somehing about my PC.
I am using Bojan´s Picall programmer with home made HW on a generic pentium
233 PC.

Any ideas on what can be hapening? or what condition should I avoid to
reduce teh risk of this happening again?
This is not funy sience this chips cost $40 each here.
Regards,

Esteban.

2000\06\26@091632 by Martin Hill

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One thing which would do it on the setup I use is if I had it set to
read the file in before programming.  Thus overriding any setup I
had already done.  Can you use a flash part instead.  I use these
almost exlusively for development now.  I just leave the code
protection bit set all the time.  Flash parts are much cheaper than
eprom parts.

Martin

{Quote hidden}

2000\06\26@094742 by Jilles Oldenbeuving

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MChip should provide a code-protect-protect-bit... so that one can
protect himself agains accidentally programming the code-protectbit <g>

Regards,

Jilles Oldenbeuving
jillesspamKILLspamrendo.dekooi.nl

-------

I have been experimenting with a 16C73B for a couple of weeks with no
problems and in the last few days I have ruined 2 of them by accidentally
code protecting them. The first time I thought it had been my mistake, but
then I has more carefull and the second one only lasted a couple of hours,
and I am completely sure about checking the code protection bits before
eache individual programming.
So I think this might have something to do with teh programmer (Ider HW or
SW) or somehing about my PC.
I am using Bojan´s Picall programmer with home made HW on a generic pentium
233 PC.

Any ideas on what can be hapening? or what condition should I avoid to
reduce teh risk of this happening again?
This is not funy sience this chips cost $40 each here.
Regards,

Esteban.

2000\06\26@100225 by Michael Rigby-Jones

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You'd forget to set it :o)

{Quote hidden}

2000\06\26@100438 by Martin Hill

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I disagree,
   If you had equal problems with this then you could end up sending
out your valueable code to customers without any protection.
Maybe some devices with NO code protection could be made
available.

Martin

{Quote hidden}

2000\06\26@175755 by Bob Ammerman

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>----- Original Message -----
>From: Martin Hill <eaxmjhispamspam_OUTNOTTINGHAM.AC.UK>
>To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
>Sent: Monday, June 26, 2000 11:03 AM
>Subject: Re: [PIC]: Code protection on 16C73B


>I disagree,
>   If you had equal problems with this then you could end up sending
>out your valueable code to customers without any protection.
>Maybe some devices with NO code protection could be made
>available.

Right: made out of bright pink plastic so that we'd never accidently send
one to a customer!

Bob Ammerman
RAm Systems

2000\06\26@185729 by Esteban Traid

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Think this posting did not go  through...

I have been experimenting with a 16C73B for a couple of weeks with no
problems and in the last few days I have ruined 2 of them by accidentally
code protecting them. The first time I thought it had been my mistake, but
then I has more carefull and the second one only lasted a couple of hours,
and I am completely sure about checking the code protection bits before
eache individual programming.
So I think this might have something to do with teh programmer (Ider HW or
SW) or somehing about my PC.
I am using Bojan´s Picall programmer with home made HW on a generic pentium
233 PC.

Any ideas on what can be hapening? or what condition should I avoid to
reduce teh risk of this happening again?
This is not funy sience this chips cost $40 each here.
Regards,

Esteban.

2000\06\27@035022 by Caisson

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> Van: Martin Hill <KILLspameaxmjhiKILLspamspamNOTTINGHAM.AC.UK>
> Aan: RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU
> Onderwerp: Re: [PIC]: Code protection on 16C73B
> Datum: maandag 26 juni 2000 17:03

That would not really be a problem *if* we had the possibility to check the
*settings* ( adresses 0x2000 thru 0x200F) afterwards.  As in : having a
Write-protected, but *unscrambled* read of this area when the Read( / Write
?) -protect is set.

I do think that being able to protect my JW -chips from inadvertedly
enableing the Write-protect is a good idea.  Not being able to Read-protect
a OTP-chip is much less costly than Read-protect a JW -chip.  And a
(currently not possible) check afterwards of the configuration-data would
alert you if there was a Write-failure of the Read-protection-bit.

My 2 cents .....

Regards,
 Rudy Wieser

{Quote hidden}

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