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:
Nov. 21, 1995
Filed:
Dec. 22, 1992
Applicant:
Inventor:
Koji Takeda, Suwa, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395550 ; 364916 ; 3649343 ; 364D / ;
Abstract
An apparatus and method for controlling the bus cycle running time of a data processing apparatus. The apparatus includes a CPU and at least one device such as a memory device, input/output device and the like which receives data from the C. A clock signal supplied to the CPU is varied based on the bus cycle or address within the device which is identified by the CPU for processing of the data. Alternatively, the frequency of the clock signal is varied based on ambient temperature and line voltage conditions. Accordingly, processing speed of the CPU can be varied to accommodate high speed memory devices and slower speed input/output devices.