本例程序主要是以51单片机系列组成的4*4矩阵键盘，键值并显示在数码管上面。本例程序来自单片机教程网：http://www.mcujc.com转载请注明来处，谢谢！-This case the program is primarily based on 51 microcontroller family consisting of 4* 4 matrix keyboard, the key and is displayed in the top of the digital tube. This case the program from a network of microcontroller tutorial: http://www.mcujc.com reproduced please specify the place of origin, thank you!