HD7279 USES serial interface mode, and manages the keyboard and LED display.
HD 7279采用串行接口方式，同时管理了键盘和LED显示器。
RS232 interface which is a standard serial interface mode has been widely used in computer communication.
RS232接口在计算机通讯中应用非常广泛，成为一种标准的串口通讯方式。
There were two kinds of interfaces: parallel and serial interface mode, serial interface was mainly discussed and an example was given for designing.
接口控制形式有并行和串行两种，着重介绍串行接口控制，并给出设计实例。
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