Signature

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Documents signature bytes used on EPROM, AT89C51, 87C51, etc.

Also known as:

  • Signature
  • Device ID
  • Identity code

TODO:

  • Are 87C51 and 89C51 signature protocols the same?
    • Looks like it
    • Also looks like some 8751 support signature
  • Do mcs51 mask ROM parts support signature?
  • Are EPROM signatures compatible with mcs51 signatures?
    • Don't think so...power pins are very different


JEDEC

https://www.jedec.org/standards-documents/docs/jep-106ab

Think these are flash specific

"JEDEC SOLID STATE TECHNOLOGY ASSOCIATION"

"The intent of this identification code is that it may be used whenever a digital field is required, e.g., hardware, software, documentation, etc."

89C51 family

IDs are found at special NV memory address 0x30-0x32

Sig (hex) Vendor Chip label Die ID Notes
1E51FF Atmel AT89C51 19052
9ED100 Atmel AT89C51 19651
1E52FF Atmel AT89C52 (19652) Die ID was for a AT89C52, but not verified to have the same signature words

87C51 family

Referneces

https://pcmhacking.net/forums/viewtopic.php?f=33&t=4668

http://www.mcumall.com/forum_GQ/post.asp?method=ReplyQuote&REPLY_ID=3587&TOPIC_ID=2105&FORUM_ID=9