51单片机矩阵键盘扫描扫描之逐行扫描法.asm程序-51 single-chip scan matrix keyboard scanning method of progressive scan. Asm program

C51实现按键检测的按下、释放、长按、连续按键。-C51 for detecting button press and release, and continuous long press .

51单片机系统设计， 包含键盘扫描部分，对相关设计人员有参考价值(Single chip microcomputer system design, including keyboard scanning part, has reference value to relevant designers)