Microcomputer using specific instruction bit and mode switch sig

Details Microcomputer using specific instruction bit and mode switch sig Microcomputer using specific instruction bit and mode switch sig

1991-07-12

1994-08-02

Lee, Thomas C.

Boots, shoes, and leggings

3649481, 364941, 3649335, 36494811, 364DIG2, 3642329, 3642632, 395425, G06F 946

Patent

active

053353315

ABSTRACT:
To increase the kinds of executable instructions of a microcomputer without increasing the number of bits (e.g. 8 bits) constituting one word or instruction, that is, without decreasing the execution speed or increasing the ROM usage, two or more instruction groups including instructions of different kinds, respectively, are provided operation modes are determined for the respective instruction groups; and the respective instruction groups to be executed are switched according to the respective operation modes. The microcomputer includes an instruction register, an execution control unit, a mode memory flip-flop, gates, two predecoders, a programmable logic array, an arithmetic logic unit, etc. The ordinary and special instruction groups can be selected in response to an interrupt entry signal and an interrupt return signal and a specific bit of an instruction, for instance.

REFERENCES:
patent: 3771138 (1973-11-01), Celtruda et al.
patent: 4135240 (1979-01-01), Ritchie
patent: 4344129 (1982-08-01), Asada et al.
patent: 4451884 (1984-05-01), Heath et al.
patent: 4519032 (1985-05-01), Mendell
patent: 4580240 (1986-04-01), Watanabe
patent: 4779187 (1988-10-01), Letwin
patent: 4876639 (1989-10-01), Mensch, Jr.
patent: 4930068 (1990-05-01), Katayose et al.

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