Intelligent-type IC card containing IC circuit and battery
First Claim
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1. An IC card having at least one IC circuit, comprising:
- power source means for supplying power to said IC circuit;
detecting means for detecting power supplied from outside said IC card so as to drive said IC card;
clock signal generating means for generating a first clock signal to drive said IC circuit; and
clock signal selecting means for selecting one of said first clock signal supplied from said clock signal generating means and a second clock signal supplied from outside said IC card, on the basis of a detection result of said detecting means, and for supplying a selected clock signal to said IC circuit.
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Abstract
An IC card and an IC card system using this card can be independently operated by a battery built in the IC card. The IC card and its system can detect power supplied from the card terminal and use a clock signal as an operating signal from the card terminal upon detection. Otherwise, a clock signal having a low frequency generated in a clock signal generating section in the card is used as an operating signal, thereby extremely reducing power consumption of the battery built into the card.
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Citations
11 Claims
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1. An IC card having at least one IC circuit, comprising:
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power source means for supplying power to said IC circuit; detecting means for detecting power supplied from outside said IC card so as to drive said IC card; clock signal generating means for generating a first clock signal to drive said IC circuit; and clock signal selecting means for selecting one of said first clock signal supplied from said clock signal generating means and a second clock signal supplied from outside said IC card, on the basis of a detection result of said detecting means, and for supplying a selected clock signal to said IC circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An IC card system comprising:
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IC card having at least one IC circuit and including first power source means for supplying power to said IC circuit, and first clock signal generating means for generating a first clock signal to drive said IC circuit; and terminal means, in which said IC card is insertable, for performing data communication with said IC card when it is inserted in said terminal means, said terminal means including second power source means for supplying power to said IC card, and second clock signal generating means for generating a second clock signal to supply said second clock signal to said IC card, said IC card further including detecting means for detecting the power supplied from said terminal means, and means for selecting one of said first clock signal generated by said clock signal generating means and said second clock signal supplied from said second clock signal generating means in said terminal means, on the basis of a detection result of said detecting means. - View Dependent Claims (8, 9, 10, 11)
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Specification