Andhra University 2005 B.Tech Information Technology - Micro Processors - Question Paper

MODEL PAPER

B. Tech (IT) Degree exam

Second Year - 2nd Semester

MICRO PROCESSORS

Time: three hrs
Max Marks: 70

First ques. is Compulsory

ans any 4 from the remaining ques.

All ques. carry equal marks

ans all parts of any ques. at 1 place

1. (a) Distinguish ranging from CPU and microprocessor
(b) Does fetch and execute overlap occur in 8085 microprocessor. Justify your ans.
(c) Draw the neat sketch showing demultiplexing of address bus and data bus in 8085 microprocessors.
(d) How do you set Zero and CARRY flags of 8085?
(e) What is the use of LOCK bar signal of 8086 microprocessor?
(f) What is the number of T states in 8086 and 8088?
(g) provide the instruction format of 8086 microprocessor.

2. (a) Write the complete specifications of 8085. discuss how Instruction Execution Process occurs in 8085 for any 1 of stack related instructions.

(b) If hold and interrupt inputs of 8085 occur simultaneously. which 1 is accepted first? Justify your ans.

3. (a) provide the basic system timing diagram of 8085.

(b) Write complete 8085 assembly language programming requirements and then write a program to obtain the GCD of 2 8-bit numbers with a flowchart.

4. (a) discuss the complete interrupt structure of 8085.

(b) provide the hardware and software for testing the interrupt logic of RST5.5 interrupt.

5. (a) discuss maximum mode and minimum mode interfaces of 8086.

(b) Is the instruction format and instruction set of 8086 and 8088 same? Justify your ans by format and example instructions with detailed instructions.

6. (a) Write a program to transfer a string of characters from a provided location to a destination location. Consider all the cases of overlapping. presume the data necessary.

(b) Write in brief about interrupts in 8086.

7. (a) define how BIU and EU interact for instruction execution with a suitable instruction sequence.

(b) Write 8086 program with minimum number of instructions for resetting a flag register.

8. (a) elaborate Prefix instructions of 8086? discuss with examples.

(b) explain about Coprocessor and Mutliprocessor environment with 8086
(c) Idents the addiess modes of every of the subsequent 8086 instructions
(i) MOV AH, [MP+2],
(ii) MOV AH, 47H,
(iii) MOV AH, [XRAY],
(iv) MOV AH, [BP+SI],
(v) MOV AH, TEMP[BS]

Earning:   Approval pending.