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. 23, 1999
Filed:
Apr. 08, 1997
Applicant:
Inventors:
Susumu Yamada, Moriguchi, JP;
Toru Watanabe, Moriguchi, JP;
Susumu Kubota, Moriguchi, JP;
Noriyuki Ogata, Moriguchi, JP;
Masanori Okubayashi, Moriguchi, JP;
Assignee:
Sanyo Electric Co., Ltd, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G11C / ;
U.S. Cl.
CPC ...
711103 ; 711152 ; 711173 ; 36518529 ; 36518533 ; 36518901 ;
Abstract
A program for rewriting data in an address region B is written in an address region A which can be rewritten by an external PROM writer. After resetting the microcomputer and rewriting the program in address region A, the reset state is cancelled and the last address in address region A of the EEPROM (1) is then stored in a register (17). An address detector (18) prohibits rewriting in address region A based on an address value stored in the register (17).