【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AT89C5 2单片机为例给出多串口扩展应用电路及相应程序框图更多还原

【Abstract】 At 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.更多还原