LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

HC 09

DEGREE EXAMINATION –COMPUTER SCIENCE

FOURTH SEMESTER – APRIL 2007

CS 4500 – MICROPROCESSORS & COMPUTER ARCHITECHTURE

 

 

Date & Time: 21/04/2007 / 9:00 – 12:00          Dept. No.                                                     Max. : 100 Marks

 

 

Part – A

Answer ALL questions.                                                                                                    10 x 2 = 20

 

1. Draw a block diagram of programmable registers in 8085.
2. List all the flags related with arithmetic and logic unit.
3. What is an assembler?
4. List out the data formats in 8085.
5. Specify the number of times the following loops are executed.

LXI B, 0007H

LOOP:   DCX B

MOV A, B

ORA C

JNZ LOOP

1. Find out the number of times the following loops are executed.

MVI A, 17H

LOOP:   ORA A

RRC

JNC LOOP

1. Define executive address.
2. Draw the basic symbols of Register Transfer Language.
3. Define Instruction Code.
4. What are the basic registers in a basic Computer?

 

Part – B

Answer ALL questions.                                                                                                    5 x 8 = 40

 

1. a) With neat diagrams, explain 8085 microprocessor architecture. (Or)

1. b) Explain All the functional units of a microcomputer system in detail.

 

1. a) Classify 8085 instruction set by their word size. (Or)

1. b) Explain Branch Instructions of 8085 instruction set.

 

1. a) Write an assembly language program to

1. Clear Accumulator
2. Add 47H

• Subtract 92H

1. Display the result after doing the above operation. (Or)
2. b) Write an assembly language program to multiply two numbers.

 

1. a) Explain 4 bit binary incrementer circuit with diagrams (Or)

1. b) Explain logic micro operations with suitable symbolic descriptions.

 

1. a) Implement common bus for all the basic registers in a microcomputer. (Or)

1. b) With neat diagrams, explain one stage of adder and logic circuit.

 

Part – C

Answer ANY TWO questions.                                                                                        2 x 20 = 40

 

1. a) Explain various addressing modes of a microcomputer. (10)

1. b) How do you classify the memory for 8085 Microprocessor? Explain. (10)

1. a) Explain various interfacing devices in a microcomputer with neat diagrams. (10)

1. b) Write complete guidelines for writing an assembly language programs. (10)

1. a) Explain Register Transfer Language for Logic Micro operations. (10)

1. b) Explain Memory Reference Instructions with suitable symbolic descriptions. (10)

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