Patent ID: 7673165

Claim:
An image processing device to perform various kinds of image processing on inputted image data, said image processing device comprising: a first function block section which includes image data processing devices, wherein said first function block section continues operation while a main power supply is on; a second function block section which need not continue operation while said main power supply is on; a sleep mode setting command input unit which inputs a sleep mode setting command to set said image processing device to a sleep mode; and a power control unit configured to disconnect the supply of power to said second function block section when the sleep mode setting command is input by said sleep mode setting command input unit; a sleep mode release command input unit which inputs a sleep mode release command to release said image processing device from the sleep mode; said power control unit restarting the supply of power to said second function block section when the sleep mode release command is input by said sleep mode release command input unit, wherein said second function block section has a data input unit which inputs various types of data, and has a data output unit which outputs various types of data, said power control unit sets said data input unit to an input disable state and sets said data output unit to an output disable state when the sleep mode setting command is input from said sleep mode setting command input unit, said input disable state and said output disable state setting input/output cells to the data input unit and the data output unit to a high impedance to current flow before disconnecting the supply of power to said second function block section, and said power control unit sets said data input unit to an input enable state and sets said data output unit to an output enable state when the sleep mode release command is input from said sleep mode release command input unit.