基于51单片机的AD9850控制程序。通过串行数据传输，只需四个IO口，相对并行数据传输要少7个IO。另外，通过四个独立按键设置输出频率值。如果滤波模块效果好，则输出40M正弦波波形良好！-Based on 51 single-chip AD9850 control procedures. Serial data transmission, only four IO ports, parallel data transfer to the relatively small 7 IO. In addition, through four separate buttons to set the output frequency value. If the filter module is good, then the sine wave output 40M good!