MICROPROCESSORS

Interfacing a DC motor generally requires

(i) Driver circuit
(ii) Counter
(iii) Keyboard
(iv) Crystal oscillator

What value should be loaded into timer register so as to have a time delay of 5 ms? Write a program to create a pulse width of 5 ms on pin P2.3. Assume crystal frequency to be 11.0592 MHz.

Interface 4-digit seven-segment display with 8051 and write a program to display BCD number 1234 on it.

Demonstrate interfacing of a 4x4 (16-key) keyboard with 8051, with neat circuit diagram and display using 8051 Microcontroller.

Write a C or assembly language program for 8051 microcontroller to create a travelling light pattern connected at port 0 after every 500 ms. Assume there are 8 LEDs connected to 8 pins of port 0. Initially after startup, the LED connected to Pin 0 should be ON. Then after 500 ms, the next LED should be ON. Only one LED should be ON at a time and remaining should stay OFF. Continue this pattern forever. Assume the crystal frequency to be 12 MHz.

Interface 4-digit seven-segment display with 8051 and write a program to display BCD numbers from 0-9 after every 1 second.

With the help of schematic diagram, explain the interfacing of stepper motor with 8051 Microcontroller. Also, write ALP to change the speed and direction of motor.

Write short notes on: Interfacing a stepper motor

Explain the working and applications of stepper motors.