User initiated microcode modification

Details User initiated microcode modification User initiated microcode modification

2005-01-18

2005-01-18

Whitmore, Stacy A. (Department: 2812)

Electrical computers and digital processing systems: processing

Instruction decoding

C713S190000

Reexamination Certificate

active

06845441

ABSTRACT:
An instruction decoding unit in a microcomputer is disclosed having an instruction word capable of being selected by a user to conveniently produce application software while maintaining security. The decoding unit in a microcomputer includes an instruction register for storing instructions fetched from a memory, an instruction decoder for decoding instruction codes of the instructions stored in the instruction register and for designating micro-instructions to be executed, a micro-ROM for outputting a series of the micro-instructions designated by the instruction decoder, and a user instruction selector for selecting or changing the micro-instructions of the micro-ROM in response to user's selection so as to change the operation of an instruction word.

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patent: 6141740 (2000-10-01), Mahalingaiah

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