基于STC8A系列单片机的高精度频率计设计

Design of High-precision Cymometer Based on STC8A

介绍了一种基于STC8A4K64S2A12单片机的高精度频率计的设计方案,可实现幅度为20mV^5V,频率为1Hz^10MHz方波、正弦波及三角波的测量。该频率计利用此系列单片机的内置比较器,将小信号转变为同频率的TTL/CMOS电平,直接进行测量。同时,根据各计数器溢出会使单片机对应端口发生电平反转的特性,将定时器级联实现了内部全自动的高精度频率测量。

This paper introduces a design scheme of a high precision cymometer based on STC8A4K64S2A12 single chip computer.It can measure square wave,sinusoidal wave and triangular wave with an amplitude of 20mV to 5V and frequencies of 1Hz to 10MHz.The cymometer uses the built-in comparator of this series of microcontrollers to Converting Small Signals to TTL/CMOS Levels of the same frequency and measure directly.