MICROPROCESSORS MODEL PAPER


FOUR YEAR B.TECH DEGREE (VSU) EXAMINATION
Third Year Examination
Second Semester
Electronics & Communication Engineering
MICROPROCESSOR AND APPLICATIONS
 (MODEL QUESTION PAPER)
Time: 3 Hours MAX: 60 Marks
Answer any five questions, choosing one full question from each unit.
All questions carry equal marks
UNIT-I
  1     (a) what is microprocessor? Explain about architecture of 8086 microprocessor? (8)
         (b)Describe the register set of 8086. (4)
(OR)
   2     (a) Explain the addressing modes of 8086 micro processor with examples. (6)
          (b) Explain minimum mode of operation of 8086. (6)

UNIT-II

   (a) Explain the following with examples.
(I)AAA (II) SBB (III) DAA (IV) CMP (8)
         (b) Write an ALP to find the average of ‘n’ numbers. (4)
(OR)
(a) Explain the following Assembler Directives with examples. (8)
(I)ASSUME (II) DB (III) SEGMENT (IV) ORG (V) EVEN (VI) PROC
         (b) Write an ALP of 8086 to interchange the two words from 2100H and 2102H. (8)

UNIT-III

 5   (a) Explain the block diagram of 8259 PIC. (6)
      (b) What is DMA? Explain the basic principle of DMA operation with neat sketch. (6)
(OR)
  6   (a) Draw the block diagram and explain about USART (8251). (8)
        (b) Compare UART and USART. (4)

UNIT-IV

  7 (a) Show the block diagram to interface ADC (0808) with 8086 microprocessor using 8255 and write                  an ALP. (6)
       (b) Write an ALP to generate sawtooth waveform. (6)
(OR)
   8   (a) explain the block diagram of 8255 PPI. (6)
        (b) Interface 64K RAM and 128K ROM to 8086 using memory chips of size 32K RAM and 64K ROM  (6)

UNIT-V

  9   (a) Explain about the architecture of 8051 microcontroller. (6)
         (b) Explain internal memory management of 8051 with neat diagram. (6)
(OR)
 10   (a) Explain the addressing modes supported in 8051 Micro controller. (6)
        (b) What are the various Special Function Registers (SFR) required to use 8051 microcontroller. (6)