Protection circuit for a microprocessor

Details Protection circuit for a microprocessor Protection circuit for a microprocessor

1994-04-05

1996-09-17

Nguyen, Hoa T.

Boots, shoes, and leggings

3642466, 364DIG1, 395402, G06F 1134

Patent

active

055577431

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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