Post by thread:12C508 Code Protection

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_OUTvulcanTakeThisOuTihug.co.nz www.geocities.com/TheTropics/Cabana/2625 --------------------------

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}

>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 \ \ .....mrtKILLspam@spam@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331 /

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 <mrtKILLspamINAME.COM> To: .....PICLISTKILLspam.....MITVMA.MIT.EDU <EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.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 \ \ mrtspam_OUTiname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331 /