Electronic device, and method controlling electronic power supply

Abstract

An electric device including: a connecting unit connected to a connection line supplying an electric power of a predetermined rating and transmitting and receiving an information; a charging unit conducting a charging of a charging battery connected to an own device, by the electric power supplied by the connection line; an electric supplying unit supplying an electric power to a recording medium storing an information; a reading-and-writing unit performing a reading-and-writing operation of the recording medium; and an electronic source controlling unit performing a control of the electric power supplied to the charging unit, when the reading-and-writing unit performs the reading-and-writing operation of the recording medium, according to an access request to the recording medium via the connection line.

What is claimed is: 
     
         1 . An electronic device comprising:
 a connecting part to which a cable is connected, wherein an electric power supplied from an external device is transmitted via the cable and data is transmitted via the cable between the electric device and the external device;   a first circuit that controls a reading-and-writing process of data for a recording medium according to a request from the external device,   a second circuit that controls the electric power supplied from the external device via the cable to charge a battery, the second circuit is configured to perform
 a first mode in which the electric power is supplied to the battery while (a) transmission of write data to the recording medium via the cable according to the request from the external device is performed or (b) transmission of read data from the recording medium according to the request from the external device is performed, and 
 a second mode in which the electric power is supplied to the battery while (a) the transmission of the write data to the recording medium via the cable according to the request from the external device is not performed and (b) the transmission of the read data from the recording medium according to the request from the external device is not performed, wherein a charged amount of the electric power supplied to the battery in the second mode is greater than a charged amount of the electric power supplied to the battery in the first mode.