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4X4-KeyBoard
- 用AT89S51的并行口P1接4×4矩阵键盘,以P1.0-P1.3作输入线,以P1.4-P1.7作输出线;在数码管上显示每个按键的“0-F”序号-Parallel port P1 with AT89S51 4 × 4 matrix keyboard connected to P1.0-P1.3 as input lines to P1.4-P1.7 as an output line in the digital display for each button on the " 0-F