Importance

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Abstract

A portable electronic device in which storage data supplied from an external device is stored in a deletable EEPROM or in a non-deletable EPROM in accordance with specified data added to the storage data and an indication of whether or not the storage data is deletable. When a plurality of areas in the EEPROM are to be accessed, data access is performed as if a single area were accessed. The number of bytes or bits as a processing unit is determined for each of the plurality of areas, and when data is written therein, attribute data is added for each processing unit. Specified data is stored together with data for discriminating the specified data, written upon use by a user, into alterable data, non-alterable data, deletable data, and non-deletable data. The alterable or deletable specified data can be altered or deleted when an alteration or deletion instruction is input and a coincidence is found between specified personal identification numbers.

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First Claim