Microprocessors and Microcontrollers — Winter 2021

Fill in the following blanks: (1) The first operation performed by the microprocessor during execution of each instruction is _________. (2) If the memory chip size is (512 x 8), the number of chips required in making 4K-byte memory is _______. (3) The addressing mode of MOV A, 30H instruction is ________.

Explain functions of following pins of 8085:

IO/M (ii) READY

Draw and explain timing diagram of STA 5000H instruction of 8085.

With the help of diagram show how de-multiplexing of address/data lines AD0- AD7 can be achieved?

Draw and explain Port-2 architecture of 8051.

Write an assembly language program that transfers a set of ten 8-bit numbers stored in external RAM starting from 1000H to internal RAM starting from 40H. Also, draw flowchart for the program logic.

Draw an interfacing scheme to interface 16K EPROM and 8K RAM with 8031. Also specify address range.

Write an output after execution of each of the following set of instructions in sequence: MOV A, #36H SWAP A ANL A, #0FH MOV P0,A

Explain register banks of 8051. How banks can be selected?

Write a subroutine that converts Hex digit into its equivalent ASCII and hence using it write a program to convert an 8-bit Hexadecimal number available in RAM at 30H into its equivalent ASCII and store the result in RAM at 40H and 41H.

Draw and explain Reset circuit of 8051.

Explain addressing modes of 8051 with example.

Apush button switch is connected with P3.2 pin of 8051 that normally pull the pin high and when pressed, the level on pin become low. Write a program that makes an emergency alarm connected with P1.0 pin ON when the switch is pressed. The alarm should automatically goes OFF after 30 second.1

Explain IE register of 8051.

Explain 8051 interrupt’s priority. How the priority can be modified?

Write a ‘c’ program that generates a square wave of 1 KHz frequency on P1.0 pin using timer-0 in mode-1. Show timer count calculation.

Differentiate between MOVX and MOVC instruction.

Draw an interfacing scheme to interface (20X2) LCD display with 8051 microcontroller.

Write an embedded ‘C’ program that displays a message “Happy New Year” in line-1 and “2021” in line-2 of LCD display.

Explain SCON register of 8051.

Draw an interfacing scheme to interface ADC0809 with 8051.

Write a program that transmits a message “Happy New Year” using serial mode-1 at 9600 baudrate. Assume oscillator frequency =11.0592 MHz. Show timer count calculation for the specified baudrate.

Draw an interfacing scheme to interface 4 x 4 matrix keyboard with 8051.

Draw an interfacing scheme to interface 4-digit common cathode seven segment display with 8051.

Using interfacing scheme in part-b, write an embedded ‘C’ program that updates and displays real time second and minute on 4-digit common cathode seven segment display.