Introduction - If you have any usage issues, please Google them yourself
To design a keyboard program, and its line (8) connected to the P0 mouth, the out line (8) connected to port P2, this keyboard encoding for 0-63, while the design of a two digital tube display, and its paragraph election signal from P1.0 to P1.6 to control the completion of the election-bit signal from P1.7, P3.2 to complete. Finally everyone encoding the button displayed on the digital tube display.
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delay.doc