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8501系列单元机通常只有一到两个串口，而当前许多系统迫切需要三个或三个以上的串口,如何解决这个问题是许多科研工作者所关心的。文章介绍了一种新型的单片机串口扩展芯片的功能特性以及在汽车行驶记录仪中的应用。
8501 series unit usually has only one or two serial ports, and many current systems urgently need three or more serial ports, how to solve this problem is of concern to many researchers. This paper introduces a new type of microcontroller serial port expansion chip features and applications in the car tachograph.