Patent ID: 8069277

Claim:
A peripheral device connected to a host device by a transmission path according to a predetermined interface standard that allows to communicate with the host device, and configured to operate with power supply received from the host device through the transmission path with either a standard current or a non-standard current, the peripheral device comprising: a main operation unit configured to use, in the operation thereof, the non-standard current that is higher than an upper limit current value of the standard current specified by the interface standard; and a control unit configured to operate in a standard power mode, which consumes the standard 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 via the transmission path, and configured to perform, 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.