On the basis of 2* 3 matrix keyboard, using the line IO and the derivative of the three key (Note that a pull-up resistor)

5 IO=9key\5 IO 9按键演示.gif
.........\Thumbs.db
.........\原理图\5 IO 9按键.BMP
.........\......\5 IO 9按键.DSN
.........\......\Thumbs.db
.........\程序\key9
.........\....\key9.hex
.........\....\key9.lnp
.........\....\key9.M51
.........\....\key9.Opt
.........\....\key9.plg
.........\....\key9.Uv2
.........\....\key9_Opt.Bak
.........\....\key9_Uv2.Bak
.........\....\main.lst
.........\....\main.obj
.........\....\source\INTRINS.H
.........\....\......\main.c
.........\....\......\REG51.H
.........\....\source
.........\原理图
.........\程序
5 IO=9key

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