单片机的多串口扩展技术的设计  

Design of Multi-serial Port Extended Technology of Single-chip-microcomputer

作　　者：刘小芳[1] 曾黄麟[1] 吕炳朝[2] 

机构地区：[1]四川理工学院计算机系,四川自贡643033 [2]电子科技大学,四川成都610054

出　　处：《计算机测量与控制》2004年第11期1088-1090,共3页Computer Measurement &Control

基　　金：四川省应用基础研究资助项目(02GY029-005)

摘　　要：针对大多数单片机都只有一个串口的局限,在多数情况下限制它们的应用。利用单片机串口扩展技术,以MCS51系列单片机8751为例进行串行接口扩展,包括扩展两个独立的串口、一点对多点分时串口、单片机与RS232/RS422/RS485的串行通信接口。实际应用证明,设计可靠,稳定性好。用多种方法进行串口扩展,解决了单片机在串行通信系统中的串口局限问题。Aiming at the limitation of a serial port in most of single-chip-microcomputers, their applications have been confined in most circumstance. Serial port extended technology of single-chip-microcomputer has been utilized in serial interface extension about 8751 of MCS51 series, including extension of two unaided serial ports, one spot to multi-spot assignment time serial port, and serial communication interface between single-chip-microcomputer and RS232/RS422/RS485. Practical application proves that the design is well reliable and stable. Multi-methods of serial port extension have solved serial port limitation problem in serial communication system of single-chip-microcomputer.

关 键 词：多串口 MCS51系列单片机 扩展技术 串口扩展 串行通信系统 串行通信接口 串行接口 点对多点 RS232 RS422 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构] TP336[自动化与计算机技术—计算机科学与技术]