摘要
介绍一种基于ＳＴＤ总线的多路ＤＴＭＦ（双音多频）通信电路的构成、工作原理及软件设计。该电路作为ＳＴＤ模板能构成远程星形分布式数据通信系统。由于采用简单实用的中断接收逻辑电路，通过软件处理中断接收的屏蔽、识别和清除，故实时性强，编程方便，接收可靠。
The make up,principle and software design of a multi loop DTMF(dual tone multi frequency) communication circuit based on STD bus is described,which with STD module can be used as star type distributed remote data communication system.Owing to its simple and practical interrupt receiving logic circuit,and with software processing of the screening, identification and clearance of interrupt receiving,the circuit features with highly real time function,easy programming and reliable receiving.
