The microprocessor clock is not a chronometer, but a signal generator that outputs pulses at a high, precise, constant frequency. The number of microprocessor clock cycle s per second of wall time depends on the microprocessor's clock speed. Wall time differs from time as measured by counting microprocessor clock pulses or cycles. (The reference to a wall clock is how the term originally got its name.) Wall time, also called real-world time or wall-clock time, refers to elapsed time as determined by a chronometer such as a wristwatch or wall clock.
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