MICROCOMPUTER SYSTEM - HITACHI CABLE

Title:

MICROCOMPUTER SYSTEM

Document Type and Number:

Japanese Patent JPH01171027

Kind Code:

A

Abstract:

PURPOSE: To attain the using of the system only for a special user by providing a response control part, and interrupting the response for an MPU when the access is not executed repeatedly within the time interval set beforehand successively for the address of one code number of above.

CONSTITUTION: A response control part 101 to inform of a bus access timing for the action of an MPU 102 is provided. The response control part 101, when the MPU 102 does not access within the time interval set beforehand successively for one address or above set beforehand, has a function to interrupt the data transfer response for the MPU 102. Consequently, when the code number is not known, a microcomputer system cannot be operated. Thus, only the special user can use the system.

Inventors:

MATSUZAKI TOSHIYUKI

Application Number:

JP33165087A

Publication Date:

July 06, 1989

Filing Date:

December 25, 1987

Export Citation:

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Assignee:

HITACHI CABLE

International Classes:

G06F12/14; G06F9/06; G06F21/12; G06F21/14; G06F21/62; (IPC1-7): G06F9/06; G06F12/14

Attorney, Agent or Firm:

Toshiyuki Usuda

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