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Changing the clock frequency—but not the supply voltage—in a power-sensitive application is useful when the DSP is simply monitoring activity or waiting for an external trigger. In high-performance battery-powered applications, however, merely changing the frequency may not save enough power. Blackfin processors, and other DSPs with advanced power-management features, allow the core voltage to be changed in tandem with frequency changes, thus seeking optimal loading of the battery for each situation.

PTM Published on: 2008-04-16