MSc Physics (Electronics I) SEM III 2022 2023 Jan 2023 PHYSICS MICRO AND INTERFACING MICROCONTROLLER AND INTERFACING Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 (a) Attempt any one:
   • (i) With reference to wp 8085 explain the difference in software and hardware 8 interrupt. What are the different hardware and software Interrupts available
   • (ii) With help of neat schematic diagram explain how you can interface IC 8255 8
   • (b) Attempt any one:
   • (i) and explain any four features each of the Keyboard section and Display 4 section in IC 8279
   • (ii) the function of following registers/blocks with reference to IC 8259 4
   • (a) In Service Register (ISR) (b) Priority Resolver
2. Q2 (a) Attempt any one:
   • (i) Explain the concept of ODD and EVEN Banks. 8
   • (ii) Explain the functions of the following 8086 pins: 8
   • (b) Attempt any one:
   • (i) Five data words are stored in consecutive memory locations having offset 4 Write an assembly language program in 8086 to find the smallest amongst these data words
   • (i) Explain the SIGN and OVERFLOW of 8086. 4
3. Q3 (a) Attempt any one:
   • (i) Write a program using Timer Interrupts of 8051 microcontroller to 8 generate two square waves — one of 5KHz frequency at pin P1.3 and another of frequency 25KHz at pin P2.3. Assume that XTAL = 22MHz
   • (ii) Give characteristics of mode 1 of Timer 8051 8 microcontrollers. Describe the steps in programming the Timer of microcontroller 8051 in mode 1 Paper Subject Code: 74788 Physics: Micro. & Interfacing Microcontroller And Interfacing (R-2018-19)
   • (b) Attempt any one:
   • G) diagram of MAX 232 and its connection to 8051 4 microcontroller. Hence describe the working of MAX 232
   • (ii) In the given program, calculate the frequency of the square wave generated 4 on pin P1.5. Include overhead due to instructions in the loop
4. Q4 (a) Attempt any one:
   • (i) Explain any eight core features of Microcontroller chip Family 8
   • (ii) Explain the Memory organization in PIC with reference to 16C6X family. 8
   • (b) Attempt any one:
   • (i) | What is Byte-oriented and Bit-oriented instructions in PIC chip instruction 4 set. Give example in each case
   • (ii) What is the role of STATUS register in PIC chip 16C61? What are the 4 different bits represented in it?
5. Q5 Attempt any four:
   • (a) Explain the three different types of transfers which can happen in active 3 transfer mode in IC 8237
   • (b) Explain the term serial communication and parallel communication with 3
   • (c) Fifty data words are stored in consecutive memory locations having offset 3 Write an assembly language program in 8086 to transfer the entire block of data words to a new offset beginning from 0700H
   • (d) Explain the meaning of the following 8086 instructions with suitable 3
   • (e) Describe ‘data framing’ with the help of suitable example. 3
   • (f) the use of RI flag in serial communication in 8051 3
   • (g) Explain the role of FSR and INDF special purpose file registers in PIC chip. 3
   • (h) What is Watchdog timer and it’s used in PIC chip? 3

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