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:
Apr. 19, 2005
Filed:
Apr. 23, 2002
Kohji Hashimoto, Tokyo, JP;
Katsuya Nakamoto, Tokyo, JP;
Masahide Fujita, Tokyo, JP;
Hiroyuki Mitsueda, Tokyo, JP;
Kohji Hashimoto, Tokyo, JP;
Katsuya Nakamoto, Tokyo, JP;
Masahide Fujita, Tokyo, JP;
Hiroyuki Mitsueda, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A microprocessor runaway monitoring control circuit with which self-diagnosis of a watchdog timer WDT can be carried out safely and cheaply even during operation of the microprocessor (CPU). A microprocessorsupplies first and second watchdog clearing signals WDand WDto first and second watchdog timers WDTand WDT, and when the both of the watchdog clearing signals WDand WDstop, the microprocessoris reset by way of a logical connector circuit. The microprocessorhas failure diagnosing meanswhich intentionally stops the first watchdog clearing signal WDand diagnoses the response of the first watchdog timer WDTon the basis of a monitor signal MNand stops the second watchdog clearing signal WDand diagnoses the response of the second watchdog timer WDTon the basis of a monitor signal MN, whereby diagnosis of the watchdog timers WDT, WDTis carried out without the microprocessorbeing stopped.