SRM University 2007 B.Tech Electronics and Communications Engineering BANK : Microprocessor and Interfacing - Question Paper

a. Fully nested mode
b. Polling method
c. Specific rotation mode
d. Special maskable mode
15. Draw the schematic for master-slave architecture of 8259A interrupt system.
16. Write a program to initialize 8259A to meet the subsequent specifications
a. Edge triggered, single
b. Mask interrupts IR1 and IR6
c. Interrupt vector address for IR0 is 7280H and call address interval is four bytes.

17. Write the initialization instructions for master slave configuration to meet the subsequent specifications.
a. The INTR of slave is routed through IR2 of the master 8259A to the 8085.
b. Master and slave are both level triggered
c. Master vector interrupt address for IR0 is 4260H.
d. Slave vector interrupt address for IR0 is 5260H.
e. Modes: Automatic rotation and AEOI
f. Address of master are 68H and 69H and the slave are 96H and 98H.
g. Buffers are not used.
18. a. describe and illustrate absolute and linear address decoding with example.
b. elaborate interfacing devices? discuss any 3 with neat sketch.
19. Compare and contrast memory mapping and peripheral mapping.
20. Explain the interfacing for 8085 processor using I/O mapping. presume DIP switches for 8 i/p and simple display of binary data with LED.
21. Design an address decoding logic circuit for interfacing 4096 X 8- 2732 EPROM with 8085
a. using partial address decoding mode- leave out A13.List the possible address range for the chip.
b. Using absolute address decoding mode
22. Design an address decoding logic circuit for interfacing 256 X 8- 8155 RAM with 8085
a. Using partial address decoding mode- leave out A14.List the possible address range for the chip.
b. Using absolute address decoding mode

UNIT – IV
PART-A
1. List the operating mode of the 8255 PPI.
2. Write down the internal components for a programmable Interface device?
3. What are handshake signal? discuss its function.
4. Give example for handshake signals and discuss them.
5. In a programmable device, how does the MPU differentiate ranging from the control register and status register, if both register have identical port address?
6. Give the I/O port addresses of 8255A?
7. Give the features of the mode-0 in 8255A.
8. Give the features of the mode-1 in 8255A.
9. Give the features of the mode-2 in 8255A
10. What are the steps to communicate with the peripherals through 8255A.
11. What is meant by BSR mode.
12. Draw the BSR control word format.
13. What are six various modes of 8254.
14. What is the relation ranging from 8254 and 8253 PIT?
15. What is the advantage of 8279 Keyboard hardware approach than the software approach?
16. Briefly write about 8279 programmable keyboard interface.
17. What are initialization commands in 8279?
18. What are most common kind of switches?
19. What are the three major tasks for getting worthwhile data from keyboard?
20. What is DMA controller?
21. What is meant by key bouncing and Debouncing in 8279?

PART – B

1. Describe about simple I/O strobed I/O and Handshake I/O?
2. Draw the 8255A programmable parallel port and discuss.
3. Explain the 8255A Programming model .
4. What are various modes in 8255A and discuss.
5. Explain the PIT architecture with diagram.
6. Explain the various modes in 8253 PIT.
7. Describe rate generator and square wave generator modes in 8253.
8. Explain initialization of 8254 PIT device.
9. Explain the mode-2 Timed Interrupt generator in 8254 PIT.
10. Briefly discuss the software and hardware triggered strobe in 8254 PIT.
11. Explain how DMA controller operates in micro computer system.
12. Explain the modes under which DMA execution has been processed.
13. Explain DMA controller with internal Register Diagram.
14. Draw the logic block diagram of 8279 and discuss.
15. List the major components of 8279 keyboard display Interface and discuss their function.



UNIT - V
Part-A
1. What is the input to the stepper motor for rotation in clockwise and anticlockwise direction?
2. What is the use of PORT A in stepper motor?
3. What is ZCD?
4. Draw the flow chart for calibration of equipment in frequency measurement.
5. Write the formulae for finding frequency in frequency measurement system.
6. What do you understand the term temp control.
7. Give the difference ranging from hardware and software system.
8. What is the use of sensor circuit for temp control?
9. Explain the functions of alphanumeric display.
10. What is alphanumeric display? provide 2 examples.
11. What is GPIB?
12. What is EPROM?
13. Give the kinds of EPROM.
14. What are the learn cycles parameters for EPROM?
15. What is RS232?
16. Give the voltage levels of RS232.
17. Give 2 features of RS232.
Part-B
1. What is stepper motor? Draw the flow chart of stepper motor control. Write the program for Stepper motor, if the rotation in clock direction and anticlockwise direction.
2. Draw the hardware for frequency measurement and obtain the time period of an ac wave of unknown frequency.
3. Draw the system hardware for temp control.
4. Draw the flow chart for temp control & discuss system software.
5. Write the program for temp control.
6. Explain how LED display in interface with microcomputer.
7. Draw the timing diagram for programming the EPROM.
8. Explain RS-232C to TTL interfacing.







ques. Bank
EC307 – Microprocessor And Interfacing

Earning:   Approval pending.