Microprocessor in response to an interrupt request for executing

Details Microprocessor in response to an interrupt request for executing Microprocessor in response to an interrupt request for executing

Filed on

1989-12-07

Date issued

1993-12-28

Examiner

Lee, Thomas C.

Patent Class

Boots, shoes, and leggings

Other Related Categories

395375, 3642302, 3642329, 3642808, 364DIG1, G06F 946, G06F 900

Type

Patent

Status

active

Patent number

052748316

Description

ABSTRACT:
A microprocessor having two different modes of operation includes a mode flag which designates one of the two operation modes of the microprocessor, and a central processing unit which executes a program in one of the two operation modes designated by the mode flag. The central processing unit includes a microprogram memory which stores an interrupt initiation microprogram, an output device which is responsive to an interrupt request for reading out the interrupt initiation microprogram from the microprogram memory and a circuit for executing the interrupt initiation microprogram to generate a sampling signal. A mode terminal is provided, which is supplied with operation mode information. A circuit responsive to the sampling signal samples a logic level of the operation mode information at the mode terminal. A circuit is provided, which is responsive to the sampled logic level from the sampling circuit in order to bring the mode flag into one of set and reset states of the mode flag designation.

REFERENCES:
patent: 4374418 (1983-02-01), Catiller et al.
patent: 4519032 (1985-05-01), Mendell
patent: 4779187 (1988-10-01), Letwin
patent: 4847616 (1989-07-01), Gotou et al.
patent: 4930068 (1990-05-01), Katayose et al.
patent: 4947315 (1990-08-01), Sokolow et al.
patent: 5021993 (1991-06-01), Matoba et al.
patent: 5036458 (1991-07-01), Matsushima et al.

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