Question: QUESTION 3: a) Design a counter system to count number of people walking through a secured door. The electronic sensor system connected to the door

QUESTION 3: a) Design a counter system to count number of

QUESTION 3: a) Design a counter system to count number of people walking through a secured door. The electronic sensor system connected to the door gives a pulse output for each person who walks through door connected to T1 of 8051. Display the number of persons cross through the door using LED's connected at Port 2. Use counter 1 operated in mode 2. c) Write a subroutine which checks the content of 20H. If it is a positive number, the subroutine find its two's complement and store it in same location and returns

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