本文介绍了AT89C2051单片机与MT8880接口的设计，说明了MT8880芯片时钟信号的产生方法，给出了用C51编制的DTMF发送和接收程序。-This article describes the AT89C2051 MCU and MT8880 interface design, illustrates the MT8880 chip clock signal generation method is given using C51 prepared by DTMF sending and receiving procedures.