Wednesday, November 4, 2009
| B.E/B.TECH.DEGREE EXAMINATION, MAY/JUNE 2007. |
| Fifth Semester |
| Computer Science and Engineering |
| CS1304 – MICROPROCESSORS AND MICROCONTROLLERS |
| (Regulation 2004) |
| Time: Three hours Maximum: 100 marks |
| Answer ALL questions |
| PART A – (10 ´ 2 = 20 marks) |
| 1. How address and data lines are demultiplexed in 8085? |
| 2. What is the function performed by SIM instruction in 8085? |
| 3. What is pipelined architecture? |
| 4. How the interrupts can be masked/unmasked in 8086? |
| 5. What are the signals involved in memory bank selection in 8086 |
| micro processor? |
| 6. How clock signal is generated n 8086? What is the maximum internal clock |
| frequency of 8086? |
| 7. What is the function of gate signal in 8254 timer? |
| 8. Write the format of KW1 in 8259. |
| 9. List the interrupts of 8051 micro controller. |
| 10. What are register banks in 8051 microcontroller? |
| PART B – (5 ´ 16 = 80 marks) |
| 11. (a) (i) Explain the various logical and arithmetic instructions available in 8085 |
| microprocessor. (10) |
| (ii) Explain the function of various flags of 8085 microprocessor (6) |
| Or |
| (b) (i) Differentiate between I/O mapped I/O and memory mapped I/O. (6) |
| (ii) Write an 8085 assembly language program to convert 8 bit binary to |
| ASCII code. (10) |
| 12. (a) (i) Describe the action taken by 8086 when INTR pin is activated. (6) |
| (ii) Write an assembly language program in 8086j to search the largest data in |
| an array. (10) |
| Or |
| (b) (i) Discuss the various addressing modes of 80896 microprocessor. (10) |
| (ii) Explain the following assembler directives used in 8086 |
| (1) ASSUME |
| (2) EQU |
| (3) DW (8) |
| 13. (a) (i) Explain in detail about memory access mechanism in 8086 (8) |
| (ii) Explain the function of following 8086 signals. |
| (1) HLDA |
| (2) RQ/GTO |
| (3) DEN |
| (4) ALE. (8) |
| Or |
| (b) (i) Draw and explain a block diagram showing 8086 in maximum mode |
| configuration. (12) |
| (ii) What are the advantages of the multiprocessor systems? (4) |
| 14. (a) (i) With the help of block diagram explain the operation of USART (8251A) |
| (10) |
| (ii) Discuss the salient features of 8259 – programmable interrupt controller. |
| (6) |
| Or |
| (b) (i) Describe the various modes of operations in 8253 programmable interval |
| Timer. (8) |
| (ii) Explain the operation of DMA controller (8237). |
| 15. (a) With a suitable block diagram, explain the architecture of 8051 |
| microcontroller. |
| (16) |
| Or |
| (b) Discuss in detail about 8051 based stepper motor control along with necessary |
| hardware and software. (16) |
http://www.ziddu.com/download/7228374/MP2.pdf.html