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通过对串口技术的研究,提出了一种用软件实现串口扩展的方法,该方法仅使用2个普通I/O引脚和1个定时器,实现了带FIFO的高速全双工串口。该方法可以节约系统开发的硬件开销。文中给出了设计程序,在STC12C1052单片机上进行测试,其通信速率达到38400bps。
Through the study of serial port technology, a method to realize serial port expansion by software is proposed. This method uses only two normal I / O pins and one timer to realize a high speed full duplex serial port with FIFO. This method can save system development hardware overhead. The article gives the design process, the STC12C1052 microcontroller test, the communication rate of 38400bps.