IC CHIP AND IC CARD

To prevent memory deterioration in an evacuation area caused by an increase in the number of times of memory-rewriting of an IC card.SOLUTION: An IC card has: means for evacuating and storing original data of a file in an evacuation area of a nonvolatile memory before writing data received from an I...

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Bibliographic Details
Main Author OISHI HIROSHI
Format Patent
LanguageEnglish
Japanese
Published 27.07.2020
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:To prevent memory deterioration in an evacuation area caused by an increase in the number of times of memory-rewriting of an IC card.SOLUTION: An IC card has: means for evacuating and storing original data of a file in an evacuation area of a nonvolatile memory before writing data received from an IC module access device in the file of the nonvolatile memory; and means for writing back the original data stored in the evacuation area to the file. Rollback possible/impossible identification information which stores whether to make the file into an object for evacuating to the evacuation area of the nonvolatile memory is stored in file management information on the file.SELECTED DRAWING: Figure 2 【課題】ＩＣカードのメモリ書き換え回数の増加による退避領域のメモリ劣化を防ぐ。【解決手段】ＩＣモジュールアクセス装置から受信したデータを不揮発性メモリのファイルに書込む前に前記ファイルの元データを前記不揮発性メモリの退避領域に退避して記憶する手段と、前記退避領域に記憶されている前記元データを前記ファイルに書き戻す手段を有し、前記ファイルのファイル管理情報に、前記ファイルを前記不揮発性メモリの退避領域に退避する対象にするか否かを記憶したロールバック可否識別情報を記憶したＩＣカードを用いる。【選択図】図２
Bibliography:Application Number: JP20190001109