Help, how to control ....with 89xx

"I have exercise"

So who, exactly, is supposed to be doing this exercise?

If you have the exercise, shoudln't you be doing it - including designing the schematic?

What work have you done so far?
What did you find?
How far did you get?
Where are you stuck?

Here's a couple of links to get you started:
www.cs.uiowa.edu/.../
http://www.keil.com/forum/docs/thread7713.asp

"I have exercise"

So who, exactly, is supposed to be doing this exercise?

If you have the exercise, shoudln't you be doing it - including designing the schematic?

What work have you done so far?
What did you find?
How far did you get?
Where are you stuck?

Here's a couple of links to get you started:
www.cs.uiowa.edu/.../
http://www.keil.com/forum/docs/thread7713.asp