基于SP2539实现单片机串口扩展的电路设计

在以单片机为核心控制单元的系统中,常常需要将单片机的一个串口扩展为多个独立的串口。以单片机STC89C52为例进行串口扩展,通过SP2539专用串口扩展芯片实现一扩四的串口扩展电路设计,并给出了软硬件设计思路。

Serial Port Expansion Circuit Design Based on SP2539

According to the system based on a microcomputer as the core control unit,a serial port of microcomputer often needs to be extended to multiple independent serial ports.This paper describes the SP2539-specific serial port expansion chip that can make one serial port of the microcontroller STC89C52 to achieve four serial ports.At the same time the software and hardware design is given.