The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 1997
Filed:
Oct. 20, 1993
Masahiro Ishikawa, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A multiplexed system including at least two microcomputers operable in parallel with each other, and watch dog timers. One of the watch dog timers is connected for receipt of an input signal from one of the microcomputers to check a program run-away condition in the one microcomputer. The other watch dog timer is connected for receipt of an input signal from the other microcomputer to check a program run-away condition in the other microcomputer. The one microcomputer checks the other watch dog timer, and the other microcomputer checks the one watch dog time. Calculation results are fed from the respective microcomputers to a comparator circuit which produces an output signal from the multiplexed system. When the one microcomputer checks the other watch dog timer, the input signal from the other microcomputer to the other watch dog timer is interrupted. The other watch dog timer is checked based on an operating condition of the other microcomputer. The calculation result fed from the other microcomputer to the comparator circuit is interrupted while the other watch dog timer is checked.