C8051工作在48Mhz下，完全有能力进行资源的扩展，以实现低成本处理器完成更复杂的任务，文章提出了一种通过单片机普通IO端口完成串口通讯的方法，很好的弥补了通讯端口不足的瓶颈 -C8051 work in 48Mhz, the resource is fully capable of expansion, in order to achieve low-cost processor to complete more complex tasks, the article presents a general IO port is completed through the microcontroller serial communication methods, good enough to make up the communications port bottleneck