Data processing apparatus

Abstract

A data processing apparatus has a first processing unit for processing an input data, a second processing unit responsive to the data processed by the first processing unit for executing a processing dependent on the data and producing a display data, and a display unit having a display drive unit and a display device for displaying the display data. The second processing unit is selectively inactivated and activated under control of the first processing unit to reduce power consumption in the second processing unit. The display drive unit is also selectively inactivated and activated under control of the first processing unit to reduce power consumption in the display unit. The display device has a memory function that maintains its display image even when supply of a display drive signal from the display drive unit is stopped, so that a latest image before inactivation of the second processing unit and/or the display drive unit for power consumption reduction is visible by an operator during the inactivated and low power consumption state of the apparatus.

1 . A mobile terminal, comprising: 
 an input unit for receiving an input from a user;    a power supply for supplying power to the mobile terminal;    an external power supply which is different from the power supply; and    a processor for controlling the mobile terminal,    wherein:    in the case of the presence of the power supply from the external power supply, the processor is always in an operation state,    in the case of the absence of the power supply from the external power supply,    the processor makes a transition to a stop state when the input unit does not receive any input during a predetermined period, and the processor makes a transition to the operation state when the input unit receives an input.