The digital frequency meter is essential metering equipment in the production field of computer, communication equipment, audio frequency and video frequency, its basic function is measure sinusoidal signal, the square-wave signal and any other periodic signal frequency and the cyclical parameter. The digital frequency meter demonstrate the measured parameter by decimal, so it has many advantages like rapidly measure、high precision and Visual display.Now we based on the single-chip microprocessor and some peripheral circuit to design and produce a frequency measurement system, and mainly research the part of programmer. The main design idear is used by timing and counting to realize the measurement of periodic signal 's frequency, and then through the M-ary conversion and use of the LED display to dynamicly display four frequency parameters, and the measurement range is 1Hz-10kHz.The programme use of assembly language, and mainly used by preparation of the compiler-wei Fu. Practical operation show that the designed system is running normally,and the results is correct. In the orthe side, it can measure the frequency and cycle parameters of a variety of cyclical changes signall through shaping the input signa's waveform, if accompanied a appropriate sensors, the system can also measure various non-periodic signal parameters, such as mechanical vibration frequency, speed and sound frequency.
Key words：Digital frequency meter system，Single-chip microcomputer system，System Design，Software Design
