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- B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010
- Fourth Semester
- Computer Science and Engineering
- CS2252 — MICROPROCESSORS AND MICROCONTROLLERS
- (Common to Information Technology)
- (Regulation 2008)
- Time: Three hours Maximum: 100 Marks
- Answer ALL Questions
- PART A — (10 × 2 = 20 Marks)
- 1. Assume that the accumulator contains data bytes 82H and the instruction
- MOV C, A (4FH) is fetched. List the steps in decoding and executing the
- instruction.
- 2. What are the second bytes in the instruction IN and OUT of
- 8085 microprocessor?
- 3. Draw the 8086 flag register format.
- 4. List different types of 8086 hardware interrupts.
- 5. Compare closely coupled configuration with loosely coupled configuration.
- 6. Mention the need for co-processor in a microprocessor based system.
- 7. Can an input port and an output port have the same port address? Justify.
- 8. Why is each channel in DMA controller restricted to 16K bytes of data
- transfer?
- 9. With XTAL = 11.0592 MHz, what value should be loaded into TH1 to have
- 9600 baud rate?
- 10. How do you select the register bank in 805l microcontroller?
- PART B — (5 × 16 = 80 Marks)
- 11. (a) (i) Write an 8085 assembly language program with flowchart for the
- following: Six bytes are stored in memory locations starting at
- XX50H. Add all the data bytes. Use register B to save any carry
- generated while adding the data bytes. Store the sum at two
- consecutive memory locations, XX70H and XX7IH. Data (H): A2,
- FA, DF, E5, 98, 8B. (8)
- (ii) Write a program to generate a continuous square wave with the
- period of s µ 500 . Assume the system clock period is 325ns and use
- bit D0 to output the square wave. (8)
- Or
- (b) (i) Explain the following 8085 instructions with an example
- JP, JPO, CM, RPE. DAA, XCHG. SPHL and PCHL. (8)
- (ii) Draw the timing diagram for the instruction
- MVI A, 32h and OUT 01h. (8)
- 12. (a) (i) Draw the internal block diagram of 8086 microprocessor and
- explain. (8)
- (ii) Explain any eight assembler directives of 8086 microprocessor. (8)
- Or
- (b) (i) Give three examples for the following 8086 microprocessor
- instructions: String Instructions, Process Control Instructions,
- Program Execution Transfer Instructions and Bit Manipulation
- Instructions. (12)
- (ii) How does one define and Call Macro parameters of 8086
- microprocessor? (4)
- 13. (a) (i) Draw the internal block diagram of 8087 Co-processor and explain
- it with 8087 control word and status word formats. (12)
- (ii) Give two examples for packed decimal data transfers and integer
- data transfers of an 8087 Co-processor. (4)
- Or
- (b) Draw the architecture of 8089 I/O Co-processor and explain. (16)
- 14. (a) Draw the block diagram of 8279 Keyboard/Display controller and explain
- how to interface the Hex Key Pad and 7-segment LEDs using 8279. (16)
- Or
- (b) (i) Draw the functional block diagram of 8254 timer and explain the
- different modes of operation. (8)
- (ii) Draw the block diagram of 8259A and explain how to program
- 8259A. (8)
- 15. (a) (i) Explain the memory structure of an 8051 Microcontroller. (8)
- (ii) How does one interface a 16 × 2 LCD Display using 8051
- Microcontroller? (8)
- Or
- (b) (i) Explain the on-chip timer modes of an 8051 Microcontroller. (8)
- (ii) Explain how to interface an 8-bit ADC with 8051 Microcontroller.
- (8)
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