Microcomputer with accumulator addressing

Details Microcomputer with accumulator addressing Microcomputer with accumulator addressing

1982-02-22

1985-02-05

Thomas, James D.

Boots, shoes, and leggings

G06F 926

Patent

active

044981350

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 look-up, 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: 3939455 (1976-02-01), Toyasawa
patent: 4156925 (1979-05-01), Tutt et al.
patent: 4378589 (1983-03-01), Finnegan et al.
patent: 4402044 (1983-08-01), McDonough et al.
"UPD7520"; EDN; Oct. 20, 1979; p. 162.
Brick et al., Bit-Slice Microprocessor Design, McGraw-Hill Book Company, 1980; pp. 34-38.

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