Matrix keyboard, a total of 4 lines, 4, 4 lines respectively connected to P3.0-P3.3, 4 columns to pick P3.4-P3.7 functions: scanning method, through the keys in 1602 the corresponding number is displayed on the LCD

34 矩阵键盘扫描法\scan
.................\scan.c
.................\scan.hex
.................\scan.LST
.................\scan.M51
.................\scan.OBJ
.................\scan.Opt
.................\scan.plg
.................\scan.Uv2
.................\scan_Opt.Bak
.................\scan_Uv2.Bak
.................\STARTUP.A51
.................\STARTUP.LST
.................\STARTUP.OBJ
34 矩阵键盘扫描法

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