Protection circuit for a microprocessor
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United States of America Patent
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-
Sep 17, 1996
Grant Date -
N/A
app pub date -
Apr 5, 1994
filing date -
Apr 5, 1994
priority date (Note) -
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Abstract
Electronic devices using microprocessors requiring additional external memory can have security protection for the microprocessors while in an expanded mode of operation. A microprocessor having a security access circuit allows executable code to be stored in a peripheral storage device, such as external EPROM, while maintaining protection to the microprocessor EEPROM by monitoring if an instruction code is generated from an internal memory source or an external memory source.
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