Signature

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?
• 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

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