UART多串口扩展器SP2349及其应用  

UART Serial Communication Port Extend SP2349 and Application

作　　者：王鹏[1] 佟科[1] 李贻涛[1] 

机构地区：[1]东北电力学院电力工程,吉林吉林132012

出　　处：《东北电力学院学报》2004年第6期71-73,78,共4页Journal of Northeast China Institute of Electric Power Engineering

摘　　要：为了满足数字化及智能化要求 ,目前以单片机为核心的智能化测控系统及电子产品应当具备网络通信功能 ,而普通单片机仅有单个UART ,远不能满足联网后同时和外部器件用UART通信的要求。SP2 349是一种新颖的串口扩展器件 ,可将 8位、16位、32位单片机的一个高波特率的UART扩展为 3个UART ,解决了普通单片机UART串口太少的问题 ,以很低的成本扩展了系统的功能。给出该器件的主要特性、引脚说明及应用说明 ,并以AT89C5At present,in order to meet the need of digital and intelligent control,intelligentized observe-control system and electric equipment based on micro-chip is capable of network communication.But general micro control unit (MCU) has only one UART which is not enough to meet the requirements of communication with peripheral equipment.SP2349 is a novel serial communication port chip that can extend one high baud rate UART of 8-bit,16-bit and 32-bit MCU to three UART,and it can solve the problem that UART in general MCU is finite and the cost is greatly application explainations、application circuit and programe flow chart are presented based on AT89C52 MCU.

关 键 词：智能化测控系统 SP2349 单片机 串口扩展器 UART 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TP368.1[自动化与计算机技术—控制科学与工程]