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. 14, 1989
Filed:
Apr. 14, 1988
Applicant:
Inventor:
Toshiharu Aihara, Tokyo, JP;
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ; G06F / ;
U.S. Cl.
CPC ...
365222 ; 365227 ; 365233 ; 365 45 ; 364707 ; 379 88 ;
Abstract
A compact electronic apparatus employs a dynamic type memory, e.g., a dynamic random access memory (DRAM), a crystal oscillator circuit for generating a high frequency signal, and a resistor/capacitor (RC) circuit for generating a low frequency signal. When the apparatus is operated, the high frequency signal is used for accessing the data stored in the DRAM. When operation of the apparatus is interrupted, the DRAM is refreshed by the low frequency signal thus reducing the entire power consumption of the apparatus, since the power consumption of the RC oscillator circuit is lower than that of the crystal oscillator circuit.