brief introduction： Introduction:A timer is a specialized type of clock for measuring time intervals.By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch; a device which counts down from a specified time interval is more usually called a timer or a countdown timer. A timer is an extremely flexible component used in a wide variety of electrical systems.Timers differ from most other clock and timing circuits because thei

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