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. 09, 1996
Filed:
Dec. 22, 1994
Hiromi Uenoyama, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
In an electrically erasable programmable ROM in which written data contains in a very limited part high-frequency reload data, the memory capacity is reduced in the following new way. An address detecting circuit (12) detects whether or not designated write addresses are within a predetermined range and discriminates the write object data, which is to be high-frequency reload data, if the designated write addresses are within the predetermined range as the result of detection. Then, three sets of identical data (D.sub.7 to D.sub.0) prepared by a data creating circuit (11) are overwritten respectively in three different memory cells (A.sub.0, A.sub.0 ', A.sub.0 '). In data reading, the individual data are read from the respective memory cells, and one of the data decided by a majority logical circuit (15) is outputted as read data.