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(a) The basic task carried out by embedded computer systems fall into two major categories:
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• Periodic or synchronous: These are executed repeatedly at regular time intervals.
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• Aperiodic or asychronous: These are executed in response to a demand or event, and are essentially random in nature.
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(b) Dealing with absolute and relative time (by having direct access to the environment's time frame [2 marks], by using an internal hardware clock that gives an adequate approximation to the passage of time in the environment [2 marks]; access to a clock [1 marks]; operations to read/set a clock or timer [2 marks]; delay a task [2 marks]
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