微控制器的多串口扩展设计  

Designs of Expanding UART Based on MCU

作　　者：孟涛[1] 王福虎[1] 陈森[1] 

机构地区：[1]中国船舶重工集团公司第七一八研究所

出　　处：《舰船防化》2009年第5期45-51,共7页

摘　　要：很多单片机应用系统常需用到多个串口,但常用的51单片机只有一个串口,常常不能满足需要。本文针对微控制器的特点,介绍了3种通用异步串口扩展方案,给出了硬件原理图和部分程序,详细介绍了实现原理和使用方法,并对3种方案的稳定性、经济成本、扩展数量及扩展方式、接口电路及通信协议的复杂程度等方面进行了详细的比较和分析,用户可根据实际情况进行选择。Multi-serial ports are widely used in single chip microcomputer application systems. But usually, one 51-series MCU has only one UART, which isn＇t able to fulfill the requirement. Based on single chip microcomputer, this paper introduces 3 designs to expand UART, provides schematic diagram of hardware and part of program, gives detailed introductions to their principles and control-methods. In the end, this paper gives a comparison with their stability, cost, extending number, extending mode, complexity of the interface circuit and etc. Users can undertake choosing according to the local conditions.

关 键 词：通用异步收/发器 串口扩展 串口通信 单片机 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]