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There is a set of kernel services which require a timekeeping mechanism in order to function. A subset of these services, specifically Timers and Timeouts, is are covered in other chapters. This chapter covers focuses on µC/OS-III's timekeeping mechanism mechanisms and basic time services. We will go over the theory of operation, use of the time services, the different tick modes that are available and how they operate, while touching on some of the implementation details.