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03/19/12 15:42
  03/19/12 15:43

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#186788 - Contacted the 8051 group at Atmel...
Responding to: ???'s previous message
Pretty much in order to program the lock bits AND unprogram the serial programming fuse you have to use a parallel programmer, unprogram the serial programming fuse first, then program the lock bits. They stated that once you enabled any sort of memory lock level it prevents any writes to the chip...including the fuse bits.

So not something I'll worry about. Level 2 and Level 3 provide the read protection I need anyway...just figured I'd further extend the security via preventing access via a serial programmer.

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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