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:
Dec. 12, 1995
Filed:
Mar. 30, 1993
Osamu Ikeda, Tokyo, JP;
Dia Semicon Systems Incorporated, Tokyo, JP;
Abstract
A power saving control system for a computer system including a CPU, comprises a mode selecting circuit for selectively operating the CPU in a normal mode with relatively high performance and high power consumption and a power saving mode with relatively low performance and low power consumption, a first monitoring circuit for monitoring addresses accessed by the CPU over a first given period in order to detect a predetermined operational state of the CPU, in which only specific address group is repeatedly accessed, a second monitoring circuit for monitoring addresses accessed by the CPU over a second given period in order to detect a predetermined operational state of the CPU, in which only specific address group is repeatedly accessed, the second given period being independent of the first given period and much longer than the first given period, and a controller associated with the mode selecting circuit for normally operating the mode selecting circuit in the normal mode and responsive to one of the first and second monitoring circuit detecting the predetermined operational state, for operating the mode selecting circuit in the power saving mode as long as the predetermined operational state is maintained.