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:
Jun. 10, 1997
Filed:
Jun. 05, 1995
Hiroyuki Koreeda, Yokohama, JP;
Tadashi Kuwabara, Yokohama, JP;
Naomichi Nonaka, Kawasaki, JP;
Keiichi Nakane, Yokohama, JP;
Shigeki Taniguchi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A power consumption control apparatus for an information processing apparatus having multi-tasking control which executes a plurality of information processing operations in parallel by time-divisionally switching a plurality of tasks in an arithmetic processing unit. The power consumption controlled apparatus detects an event where there are no information processing operations to be executed, sets the arithmetic processing unit to a power-saving mode in response to the event and immediately clears the power-saving mode set in the arithmetic processing unit in response to an interrupt signal from an input/output device. Alternatively, the power consumption control apparatus after detecting the event stops supply of a clock to the arithmetic processing unit or lowers a frequency of the clock in response to the event. Thereafter, the power consumption control apparatus immediately resumes supply of the clock to the arithmetic processing unit or raises the frequency of the clock in response to an interrupt signal from an input/output device.