Patent ID: 7426047

Claim:
An electronic device having an energy saving mode, comprising: an energy saving controller configured to switch between an ordinary mode and the energy saving mode; an I/F circuit section controlled by the energy saving controller, configured to supply electric power to an outside device in a non-contact manner, and configured to receive communication data from the outside device; and a switch controlled by the energy saving controller, and configured to supply electric power from a main power supply to the I/F circuit section, wherein in the energy saving mode, the switch is configured to turn ON intermittently during a predetermined interval, and the I/F circuit section supplies electric power to the outside device in the non-contact manner during the ON interval, and receives at least a portion of the communication data from the outside device, and when the I/F circuit section has received at least the portion of the communication data and only one bit is detected, located at a beginning of the communication data which is not in a complete form, the energy saving controller switches from a continuous electric power supply to an intermittent power supply of an ON control which is conducted for a predetermined time needed to detect the communication data in the complete form, and determines whether the communication data includes a request for a return from the energy saving mode, and wherein the ON control increases an average of electric power in the intermittent supply state by applying an increased electric power at time of the ON control.