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:
Jul. 31, 2001
Filed:
Nov. 22, 2000
Yoshiharu Takeuchi, Kariya, JP;
Takayoshi Honda, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
An electronic control unit is provided with a microcomputer, a power supply circuit and a filter circuit. The microcomputer comprises a CPU, a ROM, a RAM and a SRAM. A voltage-drop detecting circuit within the power supply circuit receives a constant voltage generated in a constant voltage circuit and outputs a voltage detection signal WI by monitoring fall of such constant voltage. The filter circuit also receives the WI signal, generates a WI(A) signal and a WI(B) signal and outputs the WI(B) signal to the SRAM as the signal for restricting the data write operation. The CPU allows start of the data write operation to the SRAM and executes the write operation of data for each data that requires the concurrency when both WI(A) and WI(B) signals indicate permission of the data write operation.