Microcomputer having separate access to complete microcode words

Details Microcomputer having separate access to complete microcode words Microcomputer having separate access to complete microcode words

1981-07-02

1985-01-22

Atkinson, Charles E.

Boots, shoes, and leggings

G06F 926

Patent

active

044955634

ABSTRACT:
A microcomputer device contains a CPU with an arithmetic/logic unit and data/address busses and registers on a single semiconductor integrated circuit having on-chip macrocode and microcode storage. A byte-wide macrocode word is fetched from the ROM and stored in an instruction register in the CPU, then multiple-byte-wide microcode words are fetched from microcode store based on this macrocode word. Also, the microcode can be accessed one byte at a time for processing through the ALU via the data/address busses and registers, as if the microcode was data.

REFERENCES:
patent: 3990052 (1976-11-01), Gruner
patent: 3991306 (1976-11-01), Raymond, Jr.
patent: 4024504 (1977-05-01), Chowning et al.
patent: 4087854 (1978-05-01), Kinoshita et al.
patent: 4224668 (1980-09-01), Peters et al.
patent: 4348720 (1982-09-01), Blahut et al.
patent: 4348723 (1982-09-01), Woods et al.

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