这个程序我花了好久才写出来的,非常的好,它可以产生很高性能的三角波,一般程序不易产生如此好的波形.-this process I have spent a long time before the writing, very good, and it can produce a very high-performance triangular wave, the general procedures have not been so good waveform.

使用8255及ADC0809实现DA转换，通过示波器可以观察到相应的波形，包括正弦波，三角波等等。,ADC0809 realization of the use of 8255 and DA conversion, can be observed through the oscilloscope corresponding waveform, including sine wave, triangular wave and so on.

函数信号发生器 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。 -Function signal generator of the system can produce sine, square, triangular wave.