Non-contact IC card and method of initializing same
First Claim
1. A non-contact IC card comprising:
- power-supply receiving means for receiving power through electromagnetic coupling with a terminal unit;
signal transmitting/receiving means for transmitting signals to and receiving signals from the terminal unit;
signal processing means, connected to the power-supply receiving means and the signal transmitting/receiving means, for processing signals; and
resetting means, connected to the signal processing means, for resetting the signal processing means when no signal has been transmitted by the signal transmitting/receiving means during a predetermined time period after the signal transmitting/receiving means has transmitted a signal.
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Accused Products
Abstract
A non-contact type IC card includes a power-supply receiving device for receiving power through electromagnetic coupling with a terminal unit; a signal transmitting/receiving device for exchanging signals with a terminal unit; a signal processing device, connected to the power-supply receiving device and the signal transmitting/receiving device, for processing signals; and a resetting device, connected to the signal processing device, for resetting the signal processing device when there is no signal exchange. A method of initializing a non-contact type IC card which receives power through electromagnetic coupling with a terminal unit and which exchanges signals with the terminal unit includes measuring elapsed time from a signal exchange between an IC card and the terminal unit and resetting the IC card if no signal exchange occurs after the elapsed time exceeds a predetermined value.
40 Citations
9 Claims
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1. A non-contact IC card comprising:
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power-supply receiving means for receiving power through electromagnetic coupling with a terminal unit; signal transmitting/receiving means for transmitting signals to and receiving signals from the terminal unit; signal processing means, connected to the power-supply receiving means and the signal transmitting/receiving means, for processing signals; and resetting means, connected to the signal processing means, for resetting the signal processing means when no signal has been transmitted by the signal transmitting/receiving means during a predetermined time period after the signal transmitting/receiving means has transmitted a signal. - View Dependent Claims (2, 3)
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4. A method of initializing a non-contact IC card that receives power through electromagnetic coupling with a terminal unit and that exchanges signals with the terminal unit by transmitting signals to and receiving signals from the terminal unit comprising:
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measuring elapsed time after exchange of a signal between the IC card and a terminal unit; and resetting the IC card if no signal is transmitted from the IC card to the terminal unit when the elapsed time exceeds a predetermined value. - View Dependent Claims (7)
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5. A non-contact IC card comprising:
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power-supply receiving means for receiving power through electromagnetic coupling with a terminal unit; signal transmitting/receiving means for transmitting signals to and receiving signals from the terminal unit; signal processing means, connected to the power-supply receiving means and the signal transmitting/receiving means, for processing signals; and resetting means, connected to the signal processing means, for resetting the signal processing means when the power-supply receiving means begins receiving power from the terminal unit.
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6. A non-contact IC card comprising:
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power-supply receiving means for receiving power through electromagnetic coupling with a terminal unit; signal transmitting/receiving means for transmitting signals to and receiving signals from the terminal unit; signal processing means, connected to the power-supply receiving means and the signal transmitting/receiving means, for processing signals; and resetting means, connected to the signal processing means, for resetting the signal processing means and comprising a re-trigger circuit receiving a trigger signal from the signal transmitting/receiving means when a signal is transmitted by and when a signal is received by the IC card, the re-trigger circuit for outputting a reset signal to the signal processing means when no trigger signal is received during a predetermined time period after a trigger signal is received from at least one of the signal transmitting/receiving means and the signal processing means.
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8. A non-contact IC card comprising:
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power-supply receiving means for receiving power through electromagnetic coupling with a terminal unit; signal transmitting/receiving means for transmitting signals to and receiving signals from the terminal unit; signal processing means, connected to the power-supply receiving means and the signal transmitting/receiving means, for processing signals; and resetting means, connected to the signal processing means, for measuring time following the most recent of transmission of a signal to and reception of a signal from the terminal unit and resetting the signal processing means after a lapse of a predetermined time period without transmission of a signal to the terminal unit. - View Dependent Claims (9)
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Specification