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  #1  
Old 05-18-2004, 02:15
hrco hrco is offline
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pic 16f84 and skip security byte?

or delete or any solution how is it possible to read this peace of electronic elemt if is read protection enable?
Any link sw, shematic or something?

thanx...
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  #2  
Old 05-18-2004, 02:54
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LOUZEW LOUZEW is offline
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pic16f84

I think there is no way !
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Old 05-18-2004, 05:43
hrco hrco is offline
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:)

I'm shure it is exist some solution which DELETE this security byte, but I don't have it....

so if any have and wan to share it will be very nice...
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  #4  
Old 05-18-2004, 06:40
reggae
 
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I'm not sure about this device in particular. I know some microcontrolers would have a security fuse, when blown you couldnt read the memory. What people started doing is drilling into the substrate and reconnecting the fuse. You would see ads in magazines for companies doing this.

Then some manufacturers started putting important circuitry over the fuse, so you would destroy the device if you try to drill to the fuse.
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  #5  
Old 05-18-2004, 09:11
koyaan
 
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http://www.google.com/search?hl=en&ie=UTF-8&q=pic16f84+%22security+bits%22&spell=1
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Old 05-18-2004, 23:24
SiNTAX SiNTAX is offline
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With early revisions of that chip there was a way to read it out even when the security was set. I'm not sure if it is still possible with newer revisions. (by supplying it with wrong voltage variations, it was possible to reset the security bit without erasing the other content)

I'm sure google will present you with more info :-)


update: quick search on google hxxp://www.cl.cam.ac.uk/~sps32/

Last edited by SiNTAX; 05-18-2004 at 23:26.
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  #7  
Old 05-19-2004, 18:12
ntfreak
 
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It was possible with early 16C84 devices as mentioned above, but I am not aware of any method for the newer 16f84 range - many have tried.

Regards
NTFreak
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  #8  
Old 05-19-2004, 21:34
e.b
 
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PIC16C84 Security

http://www.brouhaha.com/~eric/pic/84security.html

e.b
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  #9  
Old 05-20-2004, 16:54
ntfreak
 
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There are a lot of links on the web to 16c84 and the lock bits.
I mentioned the 16c84 as a reference to where the idea possibly came from.
The actual question is regarding the 16f84 and the simple answer is no, sorry.

Regards
NTFreak
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  #10  
Old 05-20-2004, 17:08
dedificator dedificator is offline
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There was some solutions with extended temperature ranges (overheating and cooling down to -60 C), combined with incorrect power supply, but you must own many chips - success is in best case 50/50 (i'll not write about the worst case ). However, this solution applies to "f" series devices too.
I'm not tried this method by myself ...

P.S.
As said before, there is not possible to 'skip' security byte, this 'byte' is hardware structure, not a memory location.

Last edited by dedificator; 05-20-2004 at 17:14.
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  #11  
Old 05-20-2004, 19:34
hrco hrco is offline
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ehhh,...

It is easy to play if you protect some pic and it is not big deal if you chrash or delet data inside of it, but any smart solution if you buy some interface, dongle or something eles which you wan to read.....
so any of sw which can detect is it fuse protect, only read protect or how many solution it have...for start and is it diferent solution for diferent pretect(he,he)...
Yes I know it is hard, but we are here to discuse about it!
People tahx for answer!
regards
hrco!
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  #12  
Old 05-25-2004, 15:40
blaster
 
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There was some solutions but very close to chip destruction - and does not work for every chip. It's a combination of rise/drop VDD and chip reading. Check elektroda.
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