个人在keil下编写的基于89C52的LJD-5100开发板的键盘扫描程序，根据CH451感应外部中断，并根据CH451键盘矩阵代码，计算键值-Individuals in keil prepared 89C52-based LJD-5100 development board of the keyboard scanning process, according to sensitive external interrupt CH45

这是一个基于89c52的程序，采用扫描的方式，驱动4X4矩阵键盘。采样并显示。-This is a 89c52-based program, by scanning drive 4X4 matrix keyboard. Sampling and displayed.

基于89c51制作的矩阵键盘可以用数码管直接显示，可以减少占用IO口(89C51 based on the matrix keyboard can be directly displayed by digital tube, you can reduce the use of IO mouth)