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David Prentice
03/20/12 05:31
Read: 506 times

#186792 - Have you tried the ordered steps?
Responding to: ???'s previous message
Since you already have an escape mechanism, you can just try the fuse / lock order before power cycling.

A serial programmer can only read locked flash after erasure.
A parallel programmer can only read locked flash after erasure.
Erased flash has very little intellectual property value.

The extra security that SerPrgEn removal gives is that your firmware will not be erased by a clever-clogs user.


List of 4 messages in thread
AT89S Fuse & Lock Bits      Jon Wilder      03/16/12 14:19      
   The SerPrgEn disable needs power cycling      David Prentice      03/16/12 14:40      
   Contacted the 8051 group at Atmel...      Jon Wilder      03/19/12 15:42      
      Have you tried the ordered steps?      David Prentice      03/20/12 05:31      

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