PIC单片机数码管试验程序，按键加1，加到999后回“0”。

PIC microcontroller LED test program, plus 1 key, added to 999 after the back to " 0."

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系统软件部分运用C语言编制单片机程序，主要包括主程序、动态扫描显示子程序和按键扫描子程序等。

System software part of the preparation of the use of C language SCM process, including the main program, dynamic scanning display routines and key scan subroutine and so on.

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