Data protective microprocessor circuit for portable data carriers, for example credit cards
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United States of America Patent
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-
Feb 4, 1997
Issued Date -
N/A
app pub date -
Jan 24, 1996
filing date -
May 8, 1991
priority date (Note) -
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Abstract
A data protective microprocessor circuit for preventing access to data or programs stored in memories, includes a microprocessor, a memory for storing an operating system, at least one memory with an individual secondary program, a circuit for monitoring a particular valid address and generating a first signal, a circuit for monitoring particular contents of a microprocessor program counter and generating a second signal, and a circuit for generating an inhibit signal based on said first and second signals.
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