B.E. (Information Technology) Third Semester (C.B.S.
)
Digital Electronics & Fundamentals of Microprocessor Paper – IV
P. Pages : 2 TKN/KS/16/7333
Time : Three Hours *0929* Max. Marks : 80
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Notes : 1. All questions carry marks as indicated.
2. Solve Question 1 OR Questions No. 2.
3. Solve Question 3 OR Questions No. 4.
4. Solve Question 5 OR Questions No. 6.
5. Solve Question 7 OR Questions No. 8.
6. Solve Question 9 OR Questions No. 10.
7. Solve Question 11 OR Questions No. 12.
8. Due credit will be given to neatness and adequate dimensions.
9. Assume suitable data whenever necessary.
10. Illustrate your answers whenever necessary with the help of neat sketches.
1. a) Write the advantages of digital system over analog system. 4
b) Perform the following operations 10
i) (1111.0101)2 = ( ) G
ii) (1011. 011)2 = ( )10
iii) (285)10 = ( )16
iv) 13 r ; r ?
41
3 r
v) 7 BF 316 2
OR
2. a) Simplify the following
i) ABC ABC AB AB BC AC 3
ii) A AB AB A B 3
b) Perform the following
i) 337 10 53810 4
using BCD addition method.
ii) 123.4410 98.7610 4
using BCD subtraction method
3. a) Simplify the given function using k-map and realize using NAND gates. 8
f A, B, C, D, E m1,4,6,10,20,22,24,26 d 0,11,16,17
b) Simplify the given function using k-map & realize using NOR gates. 5
f A, B, C, D, m 4,6,10,12,13,15
OR
4. a) Expand A B to minterms and maxterms. 4
b) Minimize the following logic functions. using k-map and realize using NAND/NOR gates.
i) F A, B, C, D, m1,3,5,8,9,11,15 d 2,13 4
ii) F A, B, C, D, m1,2,3,8,9,10,11,14. d (7,15) 5
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5. a) Design BCD to Excess – 3 code converter using NAND gates only. 8
b) Explain half and full adder. 5
OR
6. a) Design 5 x 32 decoder with four 3 x 8 decoders and a 2 x 4 decoder. 6
b) Implement the following function using 8:1 multiplexer 7
F A, B, C, D, m 0,1,3,4,7,9,10,13,15 by applying D to the input line and A,B,C to
select lines.
7. a) Explain Race around condition in JK flip flop. How it is eliminated by using JK-MS flip 8
flop.
b) Explain different types of triggering methods of flip flop. 5
OR
8. a) Convert the following.
i) SRFF to JKFF 4
ii) D type FF to T type FF 4
b) Design Mod-5 synchronous counter using JK flip flop. 5
9. a) Draw and explain the architecture of 8085 microprocessor. 9
b) Explain addressing modes of 8085 microprocessor in detail. 5
OR
10. a) Explain the following instructions. 10
i) XTHL ii) SHLD 5000H
iii) DAA iv) MOV A, M.
b) Explain instruction JMP and CALL instructions in detail. 4
11. a) Explain hardware Interrupt structure of microprocessor 8085. 7
b) Draw and explain memory read machine cycles. 6
OR
12. a) Explain the following pins in 8085 microprocessor. 8
i) READY ii) HOLD
iii) HLDA iv) TRAP
b) Explain the advanced instruction of microprocessor 8085. 5
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TKN/KS/16/7333 2
