C51程序，通过键盘串行接口芯片HD7279A，实现对8位共阴式数码管的各种操作。-C51 program, through the keyboard serial interface chip HD7279A, to achieve a total of 8-bit digital control of various vaginal operations.

hd7279a按键扫描程序，驱动8位数码管动态显示-hd7279a key scanner, drive eight digital tube dynamic display