| With the rapid development of the cause of China earthquake,great changes have taken place in the need of seimic data information related to seismic science study soever in quantity or quality, meanwhile it propels the leapfrog development of seismic observation system from analog to digital technology。Nowadays, seismic data acquisition system based on embedded technology becomes the maimstream pruducts,whose functionality is much more powerful than the previous generation in many respects,such as, huge volume srorage,real-time data trassmission,remote system controlling and so on。However, on the other hand,the power consumption becomes the bottleneck.In roder to reduce system power dissipation,this paper firstly studies the framework and realization of existing DPM and CPUfreq technologies.Next, making use of handware mechanism of power management provided by AT91SAM9G20, gives a method of calculating the system laod and based on this,realizes the cpu frequency scaling.By reducing the dymnamic power dissipation, we can achieve the goal of total system power comsumption reduction... |
