The experimental program can be divided into three modules. The key input module: scan the keyboard, read the keyboard and keys into a key buffer unit. Display module: display the contents of the display unit on the display. Main program: call key input module and display module.

矩阵键盘\LED_KEY
........\LED_KEY.C
........\LED_KEY.hex
........\LED_KEY.lnp
........\LED_KEY.LST
........\LED_KEY.M51
........\LED_KEY.OBJ
........\LED_KEY.opt.bak
........\LED_KEY.plg
........\LED_KEY.Uv2.bak
........\LED_KEY.uvopt
........\LED_KEY.uvproj
........\LED_KEY_Opt.Bak
........\LED_KEY_Uv2.Bak
........\LED_KEY_uvopt.bak
........\LED_KEY_uvproj.bak
........\STARTUP.A51
........\STARTUP.LST
........\STARTUP.OBJ
矩阵键盘

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