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介绍了80C51FA的可编程计数阵列（PCA）的基本原理及由其组成智能信号装置的其本方法，利用PCA的高分辨能力和可编程特性，无需扩展硬件既可实现高精度测频。
This paper introduces the basic principle of 80C51FA Programmable Counter Array (PCA) and its method of forming intelligent signal device. By utilizing the high resolving power and programmable features of PCA, it is not necessary to extend the hardware to achieve high precision frequency measurement.