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frequency-counter
- 基于测周法的简单频率计,以STC89C52单片机为核心构成单片机应用系统。系统主要有单片机、显示电路两部分组成。-Measurement method based on a simple frequency counter weeks to form the core of the microcontroller chip STC89C52 applications. There are single-chip system, display circuit composed of two pa