Maharashtra State Board of Technical Education 2011-4th Sem Diploma Industrial Electronics for in EngineeringSubject :- digital techniques and microprocessor(12116) - Question Paper
MSBTE ques. paper for Diploma in Industrial Electronics Engineering
Fourth Semester
Subject :- digital techniques and microprocessor(12116)
mu iiiiii ii i mi ii iii 21011
3 Hours/i00 Marks Scat No
12116
Instructions : (1) All questions are compulsory.
(2) Answer each next main question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary\
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.
Marks
1. A) Attempt any six of the following : 12
a) Draw logic diagram of IC 74181 and give name to pins.
b) State the important function of IO/M pin of 8085 microprocessor.
c) Compare Randomly Accessed Memory (RAM) and Sequentially Accessed Memory (SAM), (any two points)
d) If 8085 microprocessor system has two memory chips of 1K x 4 and two memory chips of 2K x 8 then what will be the total memory size in the system ?
e) Define encoder. Enlist various types of encoders.
f) What is the functional difference in unidirectional buffer and bidirectional buffer ?
g) Write truth table for 8:3 priority encoder.
h) What is ROM ? Give its classification.
llllll I III III 111 I III III III
Marks
12116
-2-
B) Attempt any two of the following :
8
a) Draw the format of the tlag register and explain each bit.
b) Compare following with two points.
i) Hardware-Software
ii) Machine language-Assembly language.
c) Draw the diagram of single digit BCD adder using IC 7483. Write the importance of adding 0110 in this diagram.
2. Attempt any four of the following : 16
a) What are the different types of instructions with reference to number of bytes required to represent an instruction ? Explain these types with one example.
b) Compare memory mapped I/O and peripheral (I/O) mapped I/O. (any four points)
c) Explain the role of memory in microprocessor system. Write different characteristics of memory.
d) Draw the format of RIM instruction and explain each bit.
e) Specify the contents of accumulator after execution of each instruction. Also specify the status of carry flag.
XRA A ADI FFH
I NR A CMA HLT
f) Interface two chips of IK x 8 RAM to 8085 with starting address 000011. Draw interfacing diagram and write memory map for each chip.
-3- 12116
Marks
3. Attempt any four of the following : 16
a) Explain the function of unidirectional buffer IC 74244.
b) Draw a circuit diagram of R-2R ladder DAC and write its advantage.
c) Enlist various addressing modes of 8085 instructions and explain any two of them.
d) Findout and correct the errors; if any; In the following instructions :
i) OUT 120011 ii) STAX H
iii) RAL B iv) INX A
e) Draw instruction cycle timing diagram for the given instruction. Show the contents of address and data bus :
|
Add ress |
Machine Code |
Instruction |
|
2050H |
3E |
M V1 A. 15H |
|
205 IH |
15 |
4. Attempt any four of the following : 16
a) Draw block diagram of successive approximation ADC.
b) Compare following memories (specify two points)
i) RAM-ROM ii) Static RAM-Dynamic RAM
c) Define stack. How is stack initialized ? Explain with one example.
d) Describe given instructions with reference to their operation, addressing modes, type of instruction and Hags affected by instruction.
i) MOV A, M ii) INR A
e) Draw hardware structure of 8085 interrupts. Mention clearly the type of interrupting signal and the vector location of interrupts.
0 Draw logic diagram of generation of control signals ME MR, MEMW, iOR and IOW from IO/M, RD and WR . Explain the same.
5. Attempt any two of the following :
Marks
16
12116
-4-
a) Draw block diagram of dual slope ADC and explain its working.
b) Draw pinout diagram of 2716 EPROM and state its features. Interface 2716 to 8085 microprocessor with starting address 4000H. Draw interfacing diagram and explain memory map.
c) 1) Draw the circuit to perform following operation and state its working.
2) Draw weighted register DAC and state its disadvantage.
6. Attempt any two of the following : 16
a) Draw architectural diagram of 8085 microprocessor and write function of following blocks :
i) Accumulator iii) Stack pointer
ii) Interrupt control iv) Program counter.
b) Interface 8 LEDs to 8085 through output port (1 OH). Draw interfacing diagram and w'rite ALP to turn on mid off alternate LED with the delay of 1 second continuously.
c) Draw pinout diagram and write specifications of following ICs :
ii) ADC 0809
i) DAC 0800
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Attachment: |
| Earning: Approval pending. |
