Anna University Chennai 2007 B.B.M MICROPROCESSORS AND MICROCONTROLLERS /e - Question Paper

B.E/B.TECH.DEGREE EXAMINATION, MAY/JUNE 2007.
Fifth Semester
Computer Science and Engineering
CS1304 – MICROPROCESSORS AND MICROCONTROLLERS
(Regulation 2004)

Time: 3 hours Maximum: 100 marks
ans ALL ques.

PART A – (10 x two = 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. elaborate 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. elaborate register banks in 8051 microcontroller?

PART B – (5 x 16 = 80 marks)

11. (a) (i) discuss the different logical and arithmetic instructions available in 8085
microprocessor. (10)
(ii) discuss the function of different flags of 8085 microprocessor (6)
(Or)
(b) (i) Differentiate ranging from I/O mapped I/O and memory mapped I/O. (6)
(ii) Write an 8085 assembly language program to convert eight bit binary to
ASCII code. (10)

12. (a) (i) define 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) explain the different addressing modes of 80896 microprocessor. (10)
(ii) discuss the subsequent assembler directives used in 8086
(1) presume
(2) EQU
(3) DW (8)

13. (a) (i) discuss in detail about memory access mechanism in 8086 (8)
(ii) discuss the function of subsequent 8086 signals.
(1) HLDA
(2) RQ/GTO
(3) DEN
(4) ALE. (8)
(Or)
(b) (i) Draw and discuss a block diagram showing 8086 in maximum mode
configuration. (12)
(ii) elaborate the advantages of the multiprocessor systems? (4)

14. (a) (i) With the help of block diagram discuss the operation of USART (8251A)
(10)
(ii) explain the salient features of 8259 – programmable interrupt controller.
(6)
(Or)
(b) (i) define the different modes of operations in 8253 programmable interval
Timer. (8)
(ii) discuss the operation of DMA controller (8237).

15. (a) With a suitable block diagram, discuss the architecture of 8051 microcontroller.
(16)
(Or)
(b) explain in detail about 8051 based stepper motor control along with necessary
hardware and software. (16)

Earning:   Approval pending.