Microprocessor with repeat instruction

Details Microprocessor with repeat instruction Microprocessor with repeat instruction

1985-02-12

1987-12-15

Chan, Eddie P.

Boots, shoes, and leggings

G06F 1300

Patent

active

047137495

ABSTRACT:
A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program and data memory, with separate address and data paths for program and data. 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. A multiplier circuit produces a single state multiply function separate from the ALU. One input to the ALU passes through a full-width shifter with sign extension. The on-chip program memory is a RAM which may be configured as either program or data memory space. The processor may operate will all off-chip program memory and a large on-chip data memory, or with program execution from on-chip RAM (downloaded from the off-chip program memory) using a block move instruction. A repeat instruction is used to save program space when using block-move, or when using multiply instructions as needed for digital filters or the like.

REFERENCES:
patent: 4044337 (1977-08-01), Hicks et al.
patent: 4503500 (1985-03-01), Magar
patent: 4566063 (1986-01-01), Zolnowsky et al
patent: 4577282 (1986-03-01), Caudel et al.

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