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Embedded Systems Architecture by Daniele Lacamera

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Clock management

Internal peripherals and interfaces that are not in use must also stay off. If the platform supports it, clock gating is generally the mechanism used to selectively control the clock source for each peripheral and interface on the system. Each clock line enabled in the system clock gating configuration increases the power usage. Furthermore, the higher the scaling factor applied to generate the CPU clock from a slow oscillator, the higher the energy required by the PLL. The PLL is one of the most power-demanding components of the system, and the power consumed by the CPU is also directly proportional to its clock frequency. Many CPUs are designed to run with a reduced clock speed, offering a range of possible trade-offs between ...

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