4×4矩阵式扫描键盘的扫描原理.rar 4×4矩阵式扫描键盘的扫描原理.rar-4 × 4 matrix scan keyboard scanning principle. Rar 4 × 4 matrix scan keyboard scanning principle. Rar

利用反转法扫描键盘，程序简单，理解稍有难度，方便51学习者的学习。-Inversion method by scanning the keyboard, the program is simple, a little difficult to understand, easy 51 learners.