Microcomputer with table-read and table-write instructions

Details Microcomputer with table-read and table-write instructions Microcomputer with table-read and table-write instructions

1982-02-22

1985-04-30

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 930

Patent

active

045148015

ABSTRACT:
A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program ROM and data RAM, with separate address and data paths for program and data; however, the accumulator in the data path may be used as a program address source for table-read and table-write, for example. An external program address bus allows off-chip program fetch in an expansion mode, with the opcode returned by an external data bus. A bus interchange module allows transfer between the separate internal program and data busses in special circumstances, such as accumulator addressing. The internal busses are 16-bit, while the ALU and accumulator are 32-bit. A multiplier circuit produces a single state 16.times.16 multiply function separate from the ALU, with 32-bit output to the ALU. One input to the ALU passes through a 0-to-15 bit shifter with sign extension.

REFERENCES:
patent: 3766532 (1973-10-01), Liebel, Jr.
patent: 3931615 (1976-01-01), Oliver et al.
patent: 3972029 (1976-07-01), Bailey, Jr.
patent: 4360891 (1982-11-01), Branigin et al.

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