Abstract: A power supply circuit connected to an information processor including first and second controllers via a first cable having a first signal line and a first power line and a second cable having a second signal line and a second power line includes a controller that operates using a current of a first level supplied via the second power line and that performs setup by communicating with the second controller via the second signal line and a switch circuit that supplies, to an external device controller, currents supplied via the first and second power lines. When setup of the external device controller is completed through communication between the external device controller and the first controller via the first signal line, the switch circuit supplies, to the external device controller, a current of a second level higher than the first level supplied via each of the first and second power lines.

Abstract: A peripheral device is connected to a host device by a transmission path according to a predetermined interface standard to be communicable with the host device, and operates with power supply received from the host device through the transmission path. The peripheral device includes a main operation unit and a control unit. The main operation unit uses, in the operation thereof, non-standard current higher than an upper limit current value specified by the interface standard. The control unit operates in a standard power mode, which consumes current not exceeding the upper limit current value specified by the interface standard, to send the host device information indicating the use of the non-standard current, and performs, upon receipt from the host device of permission to use an extended power mode, which consumes the non-standard current, a process of activating the operation of the main operation unit in the extended power mode.

Abstract: An electronic device can operate as an external device of an information processing apparatus. The electronic device includes a connecting unit for connecting to the information processing apparatus, a command processor for processing a command sent from the information processing apparatus through the connecting unit, a rechargeable battery, a charging controller for controlling a charging operation of the rechargeable battery, and an operating mode managing unit which, when the connecting unit is connected to an interface having a power-supply function, selects one of a normal operating mode in which the electronic device operates as the external device of the information processing apparatus, and a charging mode in which the electronic device stops operating as the external device of the information processing apparatus and charges the rechargeable battery. The command processor processes the command in accordance with the selected operating mode.

Abstract: A peripheral device is connected to a host device by a transmission path according to a predetermined interface standard to be communicable with the host device, and operates with power supply received from the host device through the transmission path. The peripheral device includes a main operation unit and a control unit. The main operation unit uses, in the operation thereof, non-standard current higher than an upper limit current value specified by the interface standard. The control unit operates in a standard power mode, which consumes current not exceeding the upper limit current value specified by the interface standard, to send the host device information indicating the use of the non-standard current, and performs, upon receipt from the host device of permission to use an extended power mode, which consumes the non-standard current, a process of activating the operation of the main operation unit in the extended power mode.

Abstract: An information display apparatus for displaying the status of a system when data is transferred between a data supply source device and a data transfer destination device is provided. The information display apparatus includes a first display section displaying information about transfer data in the data supply source device, and a second display section displaying information about a storage area for transfer data in the data transfer destination device.

Abstract: An electronic device can operate as an external device of an information processing apparatus. The electronic device includes a connecting unit for connecting to the information processing apparatus, a command processor for processing a command sent from the information processing apparatus through the connecting unit, a rechargeable battery, a charging controller for controlling a charging operation of the rechargeable battery, and an operating mode managing unit which, when the connecting unit is connected to an interface having a power-supply function, selects one of a normal operating mode in which the electronic device operates as the external device of the information processing apparatus, and a charging mode in which the electronic device stops operating as the external device of the information processing apparatus and charges the rechargeable battery. The command processor processes the command in accordance with the selected operating mode.