Write a subroutine which checks the content

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Reference no: EM132931367

QUESTION 1: a) Write an assembly language program to send continuously E3H to port 2. Timer 1 mode 1 is used to generate the time delay where the starting count start from AFH.

b) Write a program for the 8051 to transfer letter 'T&A' serially at 9600 baud continuously.

QUESTION 2:
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.

Reference no: EM132931367

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