| 摘要 |
A portable terminal that can supply power efficiently to a chip card in the portable terminal when a carrier wave is detected even while the host power is off is provided. A power control unit supplies power generated by a battery to a host unit, the chip card in the portable terminal, and a CLF unit; a first switch is connected to open or close a power supply channel to the chip card in the portable terminal, branching off from a power supply channel from the power control unit to the host unit; a second switch is connected to open or close a power supply channel to the chip card in the portable terminal, branching off from a power supply channel from the power control unit to the CLF unit; a switch control section opens the first switch and closes the second switch if the CLF unit detects a contactless RF signal, if the host unit is off or if the portable terminal is in the low battery mode, and if the contactless RF signal conforms to the communication method of the chip card in the portable terminal, and the switch control section closes the first switch and opens the second switch if the host unit is on. |
