The hardware design in detail using ZG-211 microcontroller experiment board and chip CH451, 89S52, and in the KEILC integrated development environment UVISION2 editor, compiler, run the C language program, the board can the normal operation of LED digital display, can receive the key information by the way of interrupt. Press the 1 button, display "001" Press the 3 button, display "003" Press the 4 button, display "004"

显示键盘
........\Beep.c
........\Beep.h
........\def.h
........\Display.c
........\Display.h
........\ExpBoard.hex
........\ExpBoard.Uv2
........\func.h
........\main.c
........\main.h
........\REG52.H
........\STARTUP.A51
........\sub.c
........\sub.h

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