IC card system with control of data-writing process
First Claim
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1. An IC card system comprising:
- IC card means including at least one integrated circuit having a nonvolatile memory for storing data; and
card terminal means for writing data into said IC card means when said IC card means is electrically coupled to it;
said card terminal means including;
time-measuring means for measuring a predetermined period of time;
power-supply means for supplying data-writing power to said nonvolatile memory provided within said IC card means while said time-measuring means is measuring said predetermined period of time;
detecting means for detecting a response from said IC card means; and
control means coupled to said power supply means and including means for initializing said time-measuring means when said detecting means detects said response from said IC card means, in order to supply said data-writing power from said power-supply means to said nonvolatile memory, and further including means for turning off said power-supply means when said time-measuring means finishes measuring said predetermined period of time, as a result of no response from said IC card means to said detecting means.
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Abstract
An IC card system comprises an IC card terminal and an IC card which is inserted into the terminal, the terminal including a power-supply circuit for supplying data-writing power to a memory provided in the IC card, and a timer circuit for measuring a period of time corresponding to the maximum time during which one unit of data can be written into the memory. The supply of power to the IC card is renewed every time the IC card sends a request for an unit of data, within the period of time set in the time-measuring circuit. The supply of power is stopped when the IC card makes no request for an unit of data within the above-mentioned period of time.
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Citations
7 Claims
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1. An IC card system comprising:
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IC card means including at least one integrated circuit having a nonvolatile memory for storing data; and card terminal means for writing data into said IC card means when said IC card means is electrically coupled to it; said card terminal means including; time-measuring means for measuring a predetermined period of time; power-supply means for supplying data-writing power to said nonvolatile memory provided within said IC card means while said time-measuring means is measuring said predetermined period of time; detecting means for detecting a response from said IC card means; and control means coupled to said power supply means and including means for initializing said time-measuring means when said detecting means detects said response from said IC card means, in order to supply said data-writing power from said power-supply means to said nonvolatile memory, and further including means for turning off said power-supply means when said time-measuring means finishes measuring said predetermined period of time, as a result of no response from said IC card means to said detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification