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:
Jan. 22, 2002
Filed:
Mar. 24, 1999
Shinnosuke Hayashi, Nukata-gun, JP;
Keiji Sugai, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
In an ECU for controlling an engine, a microcomputer executes a program in a mask ROM after releasing the reset, determines a signal of a specific input terminal, and switches in accordance with the foregoing determination result the self operation mode into either one of the normal mode to execute a control program in a flash ROM and the rewrite mode to update and write a data from an external unit into the ROM. A monitor circuit monitors a watchdog pulse from the microcomputer, outputs a reset pulse to the microcomputer when determining an abnormality, and alters the level of the foregoing signal to the microcomputer into the level of the normal mode into the level of the rewrite mode.