tell me can i interface keypad not for any controller or the processor and giving directly to a combinational logic circuit
then what to do with baud rate and the clock of the keypad

how to give more than one i/p then

where i can get some example circuits for that.............

 

Here is a link into our Ebook that shows a digital lock project - http://www.allaboutcircuits.com/vol_6/chpt_7/7.html.