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:
Jul. 12, 1983
Filed:
Aug. 20, 1980
Ryoji Imazeki, Hachioji, JP;
Michiya Inoue, Hino, JP;
Fujitsu Fanuc Limited, Tokyo, JP;
Abstract
A method and system for rewriting data in a non-volatile memory of the type which requires a comparatively long period of time for the rewriting of stored data. The occurrence of an interruption in power can be detected on the basis of the content of the non-volatile memory, and detection takes place after the resumption of power even if the interruption in power takes place during the rewriting operation. The non-volatile memory is provided with a flag area in which information indicating the initiation of a modification is written prior to the rewriting operation, and in which information indicating the termination of a modification is written after the rewriting operation, whereby an interruption in power which has occurred during rewriting is readily detected by reading out the information from the flag area after the restoration of power.