what can we learn from the programmed counter by an ARM CPU

Try to use the components supplied to do all the connections to make your counter to work properly. This is also a group work and you need to set some common time to work together to finish the project if you cannot finish it during the lab hours. Read the documents K148 and AT89C2051 I posted on the Moodle. 1 will give you a more detailed instruction during the lab hours