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Method and apparatus for controlling writing of flash EEPROM by microcomputer

  • US 6,567,930 B1
  • Filed: 11/12/1999
  • Issued: 05/20/2003
  • Est. Priority Date: 11/13/1998
  • Status: Expired due to Term
First Claim
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1. A method of controlling writing of a non-volatile memory electrically writable by a microcomputer, comprising:

  • (a) rewriting content of an electrically writable non-volatile memory for storing programs and data through self-programming via control by the microcomputer, and (b) upon said rewriting (a), controlling a monitoring circuit for monitoring runaway or malfunction of a program executed by said microcomputer to inhibit output of an abnormality detection signal from said monitoring circuit based upon values of an externally entered write-enable signal for enabling writing of said non-volatile memory and of a monitoring circuit operation-control signal output from said microcomputer, thereby making it possible to rewrite the content of said non-volatile member by said self-programming without shutting down or initializing said microcomputer.

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