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Embedded Systems Architecture by Daniele Lacamera

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Wake-up intervals

An important aspect to consider while designing a low-power strategy is the wake-up time intervals, or, in other words, how long the system takes to resume the execution after switching to a low-power mode. A system with real-time requirements may leave some room for compromises between power usage and reactivity, but it is important to understand the impact of the wake-up operations from the different low-power modes, in order to predict the latency of operations in the worst-case scenario. Wake-up times are very much conditioned by the hardware design of the microcontroller, and largely dependent on the architecture.

On our reference platform, while waking up from sleep mode takes a small number of CPU cycles, the situation ...

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