MICROCOMPUTER DEVICE WITH MALFUNCTION PREVENTING FUNCTION

Title:

MICROCOMPUTER DEVICE WITH MALFUNCTION PREVENTING FUNCTION

Document Type and Number:

Japanese Patent JPS5829052

Kind Code:

A

Abstract:

PURPOSE: To automatically restore the state normally, by applying interruption with the software, when an address not accessed at normal operation is referenced with a microprocessor unit.

CONSTITUTION: A vacant part where no program and data are not written in a memory 4 is written in an operation code of software interruption. When a microcomputer references an address not accessed at normal operation and reads an operation code, the job under execution at present is interrupted and registers are saved to stacks. The stacks discriminates whether or not the software interruption exists and in case of the software interruption, when the power supply turns on, the job is started by taking the same address for the reset processing of the 1st job as a job start address.

Inventors:

KATAYAMA YASUNORI
HATAKEYAMA KEISHIN
HOKARI SADAO
SHIMA KIYOYA
INABA HIROMI

Application Number:

JP12719381A

Publication Date:

February 21, 1983

Filing Date:

August 12, 1981

Export Citation:

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Assignee:

HITACHI LTD

International Classes:

G06F11/00; G06F15/78; (IPC1-7): G06F15/06

Domestic Patent References:

JPS54139443A	1979-10-29
JPS5547546A	1980-04-04
JPS5583945A	1980-06-24

Attorney, Agent or Firm:

Akio Takahashi

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