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PICList Thread
'Code protection and flash'
1999\02\25@143943 by Jon Petty

picon face
Hi everyone

I was wondering a couple of things about code protection and flash. If I
enable the code protect fuse can I erase and reprogram the 16F84 or 16F87
later as a part of an update or do you have to leave the code unprotected to
reprogram.


Thanks

Jon

1999\02\25@150207 by John Esposito

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face
Yes, you can re-program the flash; you just can't read the contents.

--John





Jon Petty <spam_OUTPhxsys3TakeThisOuTspamAOL.COM> on 02/25/99 02:24:43 PM

Please respond to pic microcontroller discussion list
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To:   PICLISTspamKILLspamMITVMA.MIT.EDU
cc:    (bcc: John Esposito/gg/DadeInt)
Subject:  Code protection and flash




Hi everyone

I was wondering a couple of things about code protection and flash. If I
enable the code protect fuse can I erase and reprogram the 16F84 or 16F87
later as a part of an update or do you have to leave the code unprotected
to
reprogram.


Thanks

Jon

1999\02\25@150408 by John Payson

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face
|I was wondering a couple of things about code protection and flash. If I
|enable the code protect fuse can I erase and reprogram the 16F84 or 16F87
|later as a part of an update or do you have to leave the code unprotected to
|reprogram.

There is a command to erase the 16Cxx which will erase the entire
code and data areas, followed by the security fuse.  I don't know
what methods are used to ensure the code/data erasure is complete
before the security fuse is erased, but I suspect Microchip prob-
ably put some effort into ensuring that given their infamous 16C84
protection "weakness" [enough people put enough effort into trying
to "crack" someone's reverse-engineered satellite decoder that one
of them finally managed to figure out how to unprotect the chip].

1999\02\27@054411 by Dr. Imre Bartfai

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face
Hi,

(unfortunately I didn't found a question mark in your letter such way I
can only guess what do you need as information). Code protected flash PIC
chips can be reprogrammed w/o any problem.
Imre


On Thu, 25 Feb 1999, Jon Petty wrote:

{Quote hidden}

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