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Time and Clocks

Many embedded systems need to coordinate their executions with the natural time of their environment. To do this, they use a hardware clock that approximates the passage of real-time. For long running programs (that is, years of non-stop execution), this clock may need to be resynchronized to some external authority (including the International Atomic Time) but from the program's point of view the clock is the source of real time [BW98, section 2.5].



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(c) Javier Miranda. Canary Islands (Spain), 2002. Version 1.0