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:
Sep. 05, 2006
Filed:
Aug. 26, 2003
Takashi Yoneda, Osaka, JP;
Tsutomu Kamiyoshi, Nara, JP;
Hiroshi Benno, Osaka, JP;
Shirou Yoshioka, Hyogo, JP;
Tsuneo Uenishi, Hyogo, JP;
Takashi Yoneda, Osaka, JP;
Tsutomu Kamiyoshi, Nara, JP;
Hiroshi Benno, Osaka, JP;
Shirou Yoshioka, Hyogo, JP;
Tsuneo Uenishi, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A backup memory, a DMA (direct memory access) controller, and a WDT (watch dog timer) are provided in addition to a CPU (central processing unit), a RAM (random access memory), and a peripheral circuit. The DMA controller exercises control so that respective data of the CPU, RAM and peripheral circuit is saved in the backup memory each time the CPU, being under normal operation, supplies a counter reset signal to the WDT, and so that the data that has been saved in the backup memory is restored to the CPU, the RAM and the peripheral circuit, respectively, if the WDT has detected a program runaway and outputted a time-over signal. Therefore, even in a case where a program runaway has occurred in the CPU, normal operation is permitted to be resumed from midway in the program.