| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize the power save of a processor without damaging real time performance. <P>SOLUTION: The execution timings of three processing elements A, B and C in respective cycles with specific time intervals as units are decided so that real time processing including those processing elements A, B and C can be periodically executed by a processor(VPU) with preliminarily decided specific time intervals in scheduling processing. Then, processing to decrease the operating speed of the VPU is executed based on the occupancy rate of a period T1 since the start timing of each cycle until the execution of the real time processing including the processing elements A, B and C is completed to the time interval of each cycle. For example, when the length of the period T1 is 1/2 of the time interval of each cycle, control to decrease the operating speed of the VPU is executed so that the length of the period T1 can be extended to the neighborhood of the time interval of each cycle. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
