AT89C51单片机与PC机的通信接口及编程

介绍了PC机与单片机采用RS-232C进行串行通信的接口方法。对于硬件接口电路中常用的一些方法进行了简要的比较,并介绍了电平转换芯片MAX232及其应用方法。在通信程序的设计中,数据传输的校验方法采用反馈-确认法,即每传送一个数据就反馈一次,由发送方确认,相当于每次都有握手信号,大大提高了数据传输的可靠性。给出了完整的PC机与单片机点对点双机通信程序。

Interface and Programming of Single-chip Microcomputer AT89C51 Communicating with IBM-PC

This paper introduces an interfacing method of IBM-PC serially communicating with single-chip microcomputer with RS-232C.It gives comparison among some methodes which are often adopted in the interfacing circuit,and introduces a chip MAX232 of level translation and its application method in detail.In the design of communication program,"feedback-confirm"is used as a check method in data transmission,namely data are always fed back and confirmed by sending-side whenever it is transmitted,which is equivalent to signal shaking hand every time.Therefore,the reliability of data transmission is greatly improved. The paper presents the whole program of IBM-PC communicating with single-chip microcomputer from point to point.