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Understand that you're talking about a specific system, here. The CPU is just one item, and not many, if any, on the forum, will be familiar with it. Over and above that you mention a keypad or keyboard, which is another component. You've given no idea what component that might be, how it connects to the micro (port or memory map), or anything else.
You tell us this is a continuation of the project. Whoopee. I doubt anyone here has done that same particular project. The fact is, your post is lacking a great deal of significant information. Further, even if you provided ALL that information, you might not find someone willing to undergo a study and familiarization process, so that they could answer your questions.
In other words, it's a pretty silly post, so far.
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