| 摘要 |
A portable information terminal has a detector for detecting a radio wave sent from a mobile telephone set and generating a power supply voltage from electric energy extracted from the radio wave. If there is no process to be carried out by the portable information terminal, then the portable information terminal is brought into a standby mode, and the supply of a main power supply voltage from a main power supply to various parts of the portable information terminal is stopped. A connector operates under the power supply voltage generated by the detector, and instructs the main power supply to supply the main power supply voltage to the various parts of the portable information terminal when it receives an indication to start data communications from the mobile telephone set. |
