HD 7279采用串行接口方式，同时管理了键盘和LED显示器。
HD7279 USES serial interface mode, and manages the keyboard and LED display.
用程序修改PC高位字节使之与P1口组合实现对多位8段LED显示器的接口，并对P3端口组合实现对键盘矩阵的接口。
Use the procedure modification PC the high a word to makes it combined with P1 to realize to pick up 8 LEDS display and combines to realize to the port of P3 to connect to the keyboard matrix.
利用键盘和显示器，设计并实现了方便、实用的人机接口模块。
Using the key buttons and monitor, a convenient man-machine communication module is accomplished.
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