大多数单片机只有一个串口,使其在许多场合的应用受到限制。在分析串口扩展原理及现有串口扩展方法基础上,提出了用单片机作为接口芯片扩展单片机串口,实现多串口设备集成的方案。经实验验证,该方案通信可靠,满足系统要求,对串口扩展及其他接口设计均有一定的启迪作用和较高的参考价值。 Most microcontrollers have only one serial port, which limits their use in many applications. Based on the analysis of the principle of serial port expansion and the existing method of serial port expansion, a scheme of extending the serial port of the microcontroller by using the single-chip microcomputer as the interface chip is proposed. The experimental verification, the program communication and reliable to meet the system requirements, the serial port expansion and other interface design has some enlightenment and a higher reference value.