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Method and apparatus for preventing unauthorized access to nonvolatile memory in electronic encoders having a voltage level detection circuit

  • US 5,675,534 A
  • Filed: 03/05/1996
  • Issued: 10/07/1997
  • Est. Priority Date: 03/05/1996
  • Status: Expired due to Term
First Claim
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1. A method for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented, the method comprising:

  • writing a first set of data to the non-volatile memory;

    generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory;

    determining whether the writing was successful by evaluating the voltage detect signal;

    reading data from the non-volatile memory responsive to the determination.

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