Patent ID: 7868649

Claim:
A data processing apparatus comprising: a storage unit configured to store data; a processing unit configured to carry out a predetermined data processing on the data in the storage unit, the storage unit being connected to the processing unit with a plurality of connecting lines; a voltage generating unit that is connected to each of the connecting lines via a corresponding termination resistor and that generates a termination voltage to be applied to the connecting lines; an interrupting unit that is connected between the connecting lines and the termination resistors, and that applies or does not apply the termination voltage to the connecting lines depending on a data processing state of the processing unit; and an invalidation unit to which a first signal that is output from the processing unit is input, wherein the invalidation unit is configured to control a contribution of power supply control to the interrupting unit by the first signal, based on a second signal received from the processing unit, wherein the second signal is an energy saving shift that instructs to shift to an energy saving mode, is input from outside the data processing apparatus, and contributes to the first signal that is related to the power supply control to the interrupting unit; and the storage unit is configured to receive the first signal from the processing unit and determine the data processing state of the processing unit based on the received first signal.