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PICList Thread
'12C508 Code Protection'
1998\03\25@180540 by Gavin Jackson

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Hi there

I would just like someone to explain
just what the code protection bits
protect.

I have just 'burnt' a OTP 12C508 and
enabled code protection. The things
is, I can still read my program from the
chip. The program only occupies the first
63 bytes.

Is the whole EPROM code protected or
just a part of it. When I read back my program
I get a warning that tell me the device is
code protected.

The PDF file on the chip doesn't have a thing
on the code protection.

Regards

Gavin
--------------------------
spam_OUTvulcanTakeThisOuTspamihug.co.nz
www.geocities.com/TheTropics/Cabana/2625
--------------------------

1998\03\25@181659 by Michael Hagberg

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See page 35 of the pdf manual D40139B

7.10 Program Verification/Code Protection

If the code protection bit has not been programmed,
the on-chip program memory can be read out for
verification purposes.

The first 64 locations can be read regardless of the
code protection bit setting.

michael


{Original Message removed}

1998\03\26@040821 by Morgan Olsson

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>The first 64 locations can be read regardless of the
>code protection bit setting.

Is it the same for all PIC:s?

Oops! don«t put secrets there...

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  .....mrtKILLspamspam@spam@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

1998\03\26@115732 by Michael Hagberg

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i looked at my 16c5x book and it have 9 bits to set for code protection. who
knows what happens if all nine are not set? i must have thought it was odd
not to protect the first 64 locations because i put a big red star in my
manual next to this section.

michael

-----Original Message-----
From: Morgan Olsson <mrtspamKILLspamINAME.COM>
To: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Date: Thursday, March 26, 1998 3:11 AM
Subject: Re: 12C508 Code Protection


>The first 64 locations can be read regardless of the
>code protection bit setting.

Is it the same for all PIC:s?

Oops! don4t put secrets there...

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  mrtspamspam_OUTiname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

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