摘 要: 本系统能够产生正弦波、方波、三角波。同时还可以作为频率计测频率。函数信号的产生由MAX038和外围电路完成，能产生1Hz—20MHz的波形。波形选择由单片机完成。输出或输入频率经74HC390分频后，由单片机完成自动频率检测显示。

关键词：波形产生器、频率计、MAX038、74HC390、AT89S51。

Abstract: this system can have the sine wave, the square-wave, the triangular wave. Simultaneously may also take the frequency measurement frequency. The function signal's production completes by MAX038 and the peripheral circuit, can have the 1Hz-20MHz profile. The profile choice completes by the monolithic integrated circuit. Output or input frequency after the 74HC390 frequency division, completes the automatic frequency detection demonstration by the monolithic integrated circuit.

key word: Profile producer, frequency meter, MAX038, 74HC390, AT89S51.