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# C51 cymometer
C51单片机方波频率计，测量范围1hz-晶振允许的范围（24分之晶振周期）
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+ 三个档位：
- 中频和高频档位测量原理相同，门限时间内计算下降沿个数
- 低频原理，门限下降沿个数内计算时间