Even if we were predisposed to giving out code, in this case we couldn't without some additional information. I would want to see exact part number and PACKAGE. That is, "pin 12" does not adequately indentify a pin, for coding purposes. On my Atmel AT89C52, pin 12 is either P3.2, no connect or P3.6 ...

For the purpose of specifying a program requirement it would be better to state that column 1 is connected to P3.2, etc. The guy building the circuit board requires the pin number.

Dennis