In the measurement of frequency is actually 1s to count time signal, numerical is signal frequency. Using single-chip microcomputer frequency plan by using two kinds of method, usually the first approach is to use own counter chip counting input puls

单片机最小系统流水灯设计，可调节运动显示的快慢。- Measuring Frequency with the 8031 Single—chip Microprocessor Minimum System

按照配置选项，产生Microsoft Riff 格式的单频正弦波(According to the configuration option, a single frequency sine wave in the Microsoft Riff format is generated)

设计椭圆滤波器及计算和显示功率互补IIR滤波器的频率响应；设计一个单带滤波器(Design elliptical filter and calculate and display the frequency response of complementary power IIR filter; Design a single band filte)