单片机键盘驱动资料，包括键盘接口技术介绍、扫描法矩阵键盘驱动程序、行列反转法矩阵键盘驱动程序、AT89S52单片机键盘接口原理图等。程序有详细的注释。资料基于AT89S52单片机系统，键盘为4×4矩阵键盘。-Singlechip keyboard-driven information, including the keyboard interface technology, the scanning matrix keyboard driver, the ranks of matrix inve