Description: First, we should 51hei microcontroller development board ne555 square wave output signal with the first pin of J7 DuPont lines, the introduction of P3.2 mouth, can show ne555 digital frequency oscillator circuit current value, rotating the potentiometer can be found in PR1 numbers have changed. Principle: 1 Number of seconds to count external pulses, such as the 1000 count, then the frequency of 1000Hz
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51_test frequency.c
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