Frequency of a wide range of applications,not only for the general measurement instruments,can also be applied to industrial control and other areas.This paper introduces the frequency of hardware and software design.Hardware through the use of a microcontroller core AT89S52 control circuits,software design module programming methods used to achieve,mainly completed and the results showed that the frequency measurements.The tools used by Protel and Keil uVision3 in design process.
Keywords: Frequency meter,single chip processor,AT89S52