| 摘要 |
<p>PURPOSE:To prevent specific information from being changed accidentally or unfairly by a keyboard by providing identification information to judge the feasibility of the change of the specific information in a user area in a non-volatile memory. CONSTITUTION:The user area 23 is provided in the non-volatile memory 12 in an integrated circuit 2, and data is stored in the area 23 corresponding to a write command from an external device. And when the data is the specific information such as a transaction record, etc., with respect to payment information, the identification information for the area 23 to be recorded is set at (11) or (01). Also, when the data to be recorded is the one other than the specific information, the identification information is set at (00) or (10). And when a change instruction is issued from the keyboard, a control element 11 checks the identification information corresponding to the area 23 to be changed. And when the identification information is set at (01) or (11), a change processing is prohibited. In such a way, it is possible to prevent the specific information from being changed accidentally or unfairly by the keyboard 5.</p> |
