EX-602 Microprocessor and Microcontroller - May 2023 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aDraw and discuss the architecture of 8086 Microprocessor.
   How to answer

   • BIU vs EU functional partition and pipelining concept
   • Registers: AX,BX,CX,DX, SP,BP,SI,DI, CS,DS,SS,ES, IP, Flags
   • Block diagram showing BIU, EU, queue, ALU, control
   • Working of fetch-decode-execute with queue
2. 7 Marks
   bWrite an assembly language program based on 8086 microprocessor instruction set to find the square root of data from 1 to n using Lookup table.
   How to answer

   • Lookup table for squares/square-roots stored in memory
   • Initialize pointer, counter for 1 to n
   • Loop using XLAT or indexed addressing to fetch result
   • 8086 ALP with data/code segment setup and termination
3. 7 Marks
   aShow the memory organization and interfacing with 8086 microprocessor. Explain how the memory is accessed.
   How to answer

   • Even/odd bank organization with BHE and A0
   • 1 MB address space, segment:offset addressing
   • Interfacing diagram with decoders, latches, RD/WR, M/IO
   • Byte/word access cycles for aligned and misaligned data
4. 7 Marks
   bWrite a program based on 8086 instructions set to multiply a constant value to a sequence of data from 1 to n stored in memory.
   How to answer

   • Initialize data pointer, counter n and constant
   • Loop for 1 to n sequence from memory
   • Use MUL instruction for 8/16-bit multiplication
   • Store results and terminate program
5. 7 Marks
   aDraw the block diagram of 8255 A programmable peripheral interface and explain each block.
   How to answer

   • Block diagram with Port A, B, C, control logic, data bus buffer
   • Read/write control and A0,A1, CS, RESET functions
   • Group A and Group B control blocks
   • Modes 0,1,2 overview for each block
6. 7 Marks
   bDiscuss the internal architecture of 8254 programmable interval timer.
   How to answer

   • Three independent 16-bit counters/timers
   • Data bus buffer, read/write logic, control word register
   • CLK, GATE, OUT pins for Counter 0,1,2
   • Six operating modes and counting functions
7. 7 Marks
   aDraw the pin diagram of 8051 microcontroller and explain its port structure.
   How to answer

   • 40-pin diagram with VCC, VSS, XTAL, RST, EA, PSEN, ALE
   • Port 0 to Port 3 alternate functions
   • Bidirectional I/O and open-drain features
   • Port structure circuit with pull-ups and multiplexed address-data
8. 7 Marks
   bWrite an assembly language program based on 8051 microcontroller instruction set to perform four arithmetic operations on 2, 8 bit data.
   How to answer

   • Use ADD, SUBB, MUL, DIV instructions for 8-bit data
   • Initialize two 8-bit operands in registers/memory
   • Perform four operations sequentially with flags/accumulator
   • Store results and handle carry/borrow/overflow
9. 7 Marks
   aExplain the Interrupt structure with the associated registers in 8051 microcontroller.
   How to answer

   • Five interrupt sources and vector addresses
   • IE and IP registers bit functions
   • Priority structure and polling sequence
   • Interrupt enable, handling and RETI flow
10. 7 Marks
    bName and explain serial communication modes. Also discuss 8051 serial communication.
    How to answer

    • Modes 0,1,2,3 baud rates and frame format
    • SCON, TMOD, TH1 for baud generation
    • REN, TI, RI operation in 8051
    • Block diagram of serial port transmission/reception
11. 7 Marks
    aHow you will connect 8051 microcontroller to RS232? Explain in detail.
    How to answer

    • TTL to RS232 voltage level mismatch and MAX232 role
    • TXD,RXD connection through charge-pump converter
    • Capacitors, DB-9 connector wiring
    • Baud rate and SCON settings for communication
12. 7 Marks
    bWhy do we need A/D converter and D/A converter? Draw the block diagram to interface 8051 microcontroller with A/D convertor and D/A convertor.
    How to answer

    • Need for analog-digital interfacing with real world
    • ADC 0808/0809 and DAC 0808 interfacing principle
    • Block diagram with 8051 ports, ALE, OE, EOC signals
    • Control program flow for conversion
13. 7 Marks
    aDraw and explain a functional block diagram of 8096.
    How to answer

    • CPU, PTS, bus controller, A/D, serial, timers blocks
    • Functional block diagram of 8096
    • 16-bit architecture and high-speed I/O features
    • Interconnection and operation of each block
14. 7 Marks
    bWhat are the hardware features of 8096? Explain in detail.
    How to answer

    • 16-bit CPU, 232-byte register file, 8K ROM
    • High-speed I/O, 10-bit A/D, PWM, timers
    • Serial port, PTS, watchdog, interrupts
    • Operating frequency, packaging and power modes
15. 14 Marks
    Write a short note on any two:

    1. a)USART 8251
    2. b)DMA Controller (8257)
    3. c)8051 based Thyristor firing circuit
    4. d)16/32 bit PIC microcontroller
    How to answer

    • Definition, block diagram and modes of selected topics
    • Key registers/pins and operating principle
    • Interfacing/application example
    • Advantages and uses in microprocessor systems