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:
Aug. 07, 2007
Filed:
Feb. 28, 2006
Takao Watanabe, Fuchu, JP;
Kunio Uchiyama, Kodaira, JP;
Osamu Nishii, Inagi, JP;
Naohiko Irie, Kokubunji, JP;
Hiroyuki Mizuno, Kokubunji, JP;
Takao Watanabe, Fuchu, JP;
Kunio Uchiyama, Kodaira, JP;
Osamu Nishii, Inagi, JP;
Naohiko Irie, Kokubunji, JP;
Hiroyuki Mizuno, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When a leakage current of a circuit block under a non-use state is reduced by means of a power switch, frequent ON/OFF operations of the switch within a short time invite an increase of consumed power, on the contrary. Because a pre-heating time is necessary from turn-on of the switch till the circuit block becomes usable, control of the switch during an operation deteriorates a processing time of a semiconductor device. The switch is ON/OFF-controlled with a task duration time of a CPU core for controlling logic circuits and memory cores as a unit. After the switch is turned off, the switch is again turned on before termination of the task in consideration of the pre-heating time.