IC card having a display for displaying a response state
First Claim
1. An IC card responsive to externally applied data for performing a data communication, comprising:
- first storing means into which said externally applied data is written;
second storing means for saving said data written in said first storing means;
control means for making a control for a response using said data in said first storing means, or said second storing means, and display means for displaying a response state in response to an instruction from said control means;
wherein said control means includes, determination means for determining whether a state of writing said data in said first storing means is normal; and
recovery means for recovering a content in said first storing means using said data in said second storing means, in response to an abnormality determination by said determination means, said display means for displaying that said response state is normal if said determination means makes a normality determination, that said data is recovered if said determination means makes an abnormality determination and a recovery processing is performed in said recovery means, and that said response state is abnormal if said determination means makes an abnormality determination and a recovery processing is not successful in said recovery means.
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Accused Products
Abstract
An IC card may externally display a response state in a data communication performed in response to externally applied data. IC card (100) is provided with a data protecting memory (3) for data holding memory (2). An abnormality determination circuit (1) determines how data in data holding memory (2) has been processed. If abnormality determination circuit (1) determines that the externally applied data has been normally written in data holding memory (2), a response state display (7) gives a normal communication completion indication in response to an instruction from a main control circuit (11). Meanwhile, if the presence of an abnormality is determined in the state of writing data, and the data in data holding memory (2) has been recovered using data in data protecting memory (3), response state display (7) gives a data recovery indication. If the recovery of the data is not successful, a communication abnormality indication is made.
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Citations
9 Claims
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1. An IC card responsive to externally applied data for performing a data communication, comprising:
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first storing means into which said externally applied data is written;
second storing means for saving said data written in said first storing means;
control means for making a control for a response using said data in said first storing means, or said second storing means, and display means for displaying a response state in response to an instruction from said control means;
wherein said control means includes, determination means for determining whether a state of writing said data in said first storing means is normal; and
recovery means for recovering a content in said first storing means using said data in said second storing means, in response to an abnormality determination by said determination means, said display means for displaying that said response state is normal if said determination means makes a normality determination, that said data is recovered if said determination means makes an abnormality determination and a recovery processing is performed in said recovery means, and that said response state is abnormal if said determination means makes an abnormality determination and a recovery processing is not successful in said recovery means. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. An IC card responsive to externally applied data for performing a data communication, comprising:
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first storing means into which said externally applied data is written;
second storing means for saving said data written in said first storing means;
control means for making a control for a response using said data in said first storing means, or said second storing means, and display means for displaying a response state in response to an instruction from said control means;
wherein said control means includes, first determination means for determining whether a state of writing said data into said first storing means is normal or abnormal;
second determination means for determining whether a state of writing said data into said second storing means is normal or abnormal;
first recovery means for recovering a content in said first storing means in response to an abnormality determination by said first determination means; and
second recovery means for recovering a content in said second storing means in response to an abnormality determination by said second determination means, said display means for displaying the state of said data communication in response to a result of determination by said first determination means, a result of determination by said second determination means, a result of recovery by said first recovery means and a result of recovery by said second recovery means. - View Dependent Claims (9)
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Specification