Reduction of noise current in microprocessor system - controlling operating clock frequency w.r.t. program activity level to relate to average clock frequency value

摘要

Tbe relative program activity of a microprocessor is on average 43 percent of the total time available, and for this a higher clock frequency is used. For the remaining period a lower frequency is used. The average clock frequency to be adopted is determined on the basis of reducing the noise currents in the processor system. The ratio of average clock frequency to the higher frequency is related to the average power of the microprocessor. For specific higher to lower frequency ratios, an optimum condition may be determined. USE - For display of vehicle dashboard.