| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To allow a processor to save power, and to improve processing efficiency by dynamically changing an operating frequency in a range up to an upper limit frequency. <P>SOLUTION: A hardware (HW) profile holding section 113 holds profile information including a rated frequency and the upper limit frequency for a processor 101. When image data are processed by an arithmetic circuit 111, a clock frequency control section 102 detects an operating rate of the processor 101 from an arithmetic operation time period and an idle time period of the processor 101. When the operating rate reaches 100%, the clock frequency control section changes the operating frequency of the processor 101 for a value in a range up to the upper limit frequency and higher than a rated frequency on the basis of the rated frequency and the upper limit frequency which the profile holding section 113 holds. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
