Internal timing counter T0 1, 8051, according to counter mode and methods of 1, to P3.4 (T0) pin count. Its value according to the binary number displayed on the P1 mouth drive leds. 2, external event count pulse introduced by P3.4 T0 timer. SCM in each machine cycle sampling the input waveform, so SCM needs at least two machine cycles to detect a jump. This request is sampling level to maintain at least one full machine cycle, in order to make sure the level before they can change by sampling. At the same time it determines the frequency of the input waveform frequency cannot exceed the machine cycle.

第三次实验.wps

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