Patent ID: 8190927
Filing Date: 2012-05-29
Classification: G06F,H04N,Y02D

Abstract:
1. An image processing apparatus having a normal power mode and a power saving mode, comprising: a serial bus; a serial bus PHY configured to control a physical layer of the serial bus, the serial bus PHY being turned off in the power saving mode; a main CPU configured to perform a connection setting process of an external device connected to the serial bus, the main CPU being turned on in the normal power mode and being turned off in the power saving mode; a sub CPU configured to control the serial bus, the sub CPU being turned on both in the normal power mode and the power saving mode; a voltage detection unit configured to detect a voltage output from the external device connected to the serial bus; a power mode control unit configured to cause the image processing apparatus to switch from the power saving mode to the normal power mode when the voltage is detected by the voltage detection unit; a physical layer control unit configured to turn on the serial bus PHY after the image processing apparatus switches from the power saving mode to the normal power mode; a ROM configured to store a start-up program for starting the normal power mode; and a nonvolatile RAM being turned off in the power saving mode, wherein the main CPU is configured to store the start-up program in the nonvolatile RAM before the image processing apparatus switches from the normal power mode to the power saving mode and to execute the start-up program stored in the nonvolatile RAM when the image processing apparatus switches from the power saving mode to the normal power mode, the sub CPU is configured to turn on the main CPU when the image processing apparatus switches from the power saving mode to the normal power mode.