| 摘要 |
An IC card which operates at either an operation mode or a power save mode, the processing in the operation mode being carried but in accordance with a command signal inputted from a predetermined external equipment, and the power save mode being capable of terminating its operations and returning to the operation mode upon reception of a predetermined release signal, the IC card including an information processing circuit provided in the IC card and a release signal generating circuit for outputting, the release signal to the information processing circuit within the IC circuit at the time when the command signal from the external equipment is received, wherein the information processing circuit executes the process corresponding to the command signal received from the external equipment during the operation mode, and thereafter causes the IC card to move to the power save mode. A portable terminal for allowing the power save mode operation of the IC card which includes a clock signal generating circuit capable of generating a clock signal having a lower frequency than the rated clock frequency of the IC card; and an interface capable of data, transfer relative to the IC card at the data transmission rate in proportion to a ratio of the lower frequency of the clock signal generated by the clock signal generating circuit to the rated clock signal frequency.
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