| 摘要 |
<p>PURPOSE:To raise the processing efficiency of a processor by varying an operation clock frequency by a control from an arbitration control circuit for controlling a main processor and a subprocessor. CONSTITUTION:A clock control circuit 43 varies a generation frequency by a control from an arbitration control circuit 3. That is to say, when a subprocessor 2 does not operate but only a main processor 1 is operating, the highest frequency by which the device 1 can operate is generated. In this state, when it is informed that the device 2 is started, a frequency being suitable thereto is generated. In this way, the efficiency of a processing of a central processing unit constituted of the main processor and the subprocessor is raised.</p> |
