Wednesday, November 4, 2009
| B.E/B.TECH.DEGREE EXAMINATION, NOV/DEC 2006. |
| 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. Name the various Flag bits available in an 8085 microprocessor. |
| 2. Give the significance of SIM and RIM instruction available in 8085. |
| 3. What do you mean by pipelining in an 8086 processor? |
| 4. How the 20 bit effective, address is calculated in an 8086 processor? |
| 5. What is the purpose of CLK signal in an 8086 system? |
| 6. What is the use of Latch signal on the AD0 – AD15 bus in an 8086 system? |
| 7. Name the two modes used by the DMA processes to transfer data. |
| 8. Name the six modes of operations of an 8253 programmable interval timer. |
| 9. Differentiate a micr oprocessor and a microcontroller. |
| 10. Differentiate RRA and RRCA instruction in 8051 microcontroller. |
| PART B – (5 ´ 16 = 80 marks) |
| 11. (a) (i) With a neat block diagram explain the architecture of an 8085 |
| Microprocessor? (12) |
| (ii) List out the Mask able and Non – Mask able interrupts available in an |
| 8085 processor. (4) |
| Or |
| (b) (i) How do the instructions of 8085 is classified based on their functions |
| and word length? Give an example. (10) |
| (ii) Write an ALP to add two 8 bit numbers. |
| 12. (a) (i) With the neat sketch explain the architecture of an 8086 processor. |
| (ii) Give the significance of O Flag, T Flag and I Flag, D Flag of 8086. (4) |
| Or |
| (b) (i) Explain in detail about the various addressing modes used in 8086 |
| processor? Give an example. (12) |
(ii) Name the various segment registers and their usage in 8086 processor. (4)
| 13. (a) (i) Explain the MIN/MAX mode operation of an 8086 processor. (10) |
| (ii) Give a note on the role of a decoder in memory interfacing with |
| example. (6) |
| Or |
| (b) (i) Explain in detail about the 8086 memory banks and the associated |
| signals for byte and word operations. |
| (ii) Give the significance of RQ/GTO and IO/M signals. (4) |
| 14. (a) (i) With a neat sketch kand explain the operation of an Interrupt |
| controller(8259) (14) |
| (ii) What jis the use of CAS0, CAS1 and CAS2 signals? |
| Or |
| (b) Draw the block diagram of a DMA controller (8237) and explain its |
| operation. |
| 15. (a) (i) With the help of a functional block diagram explain any one application |
| of 8051 microcontroller. (16) |
| Or |
| (b) Give the PIN details of an 8051 microcontroller and explain. (16) |
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