LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

AC 13

FIRST SEMESTER – NOV 2006

PH 1808 – ELECTRONICS – I

 

 

Date & Time : 31-10-2006/1.00-4.00     Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

1. Draw the circuit diagram of an Integrator using an operational amplifier.
2. State any two advantages of a R-2R D/A converter over a binary weighted D/A converter.
3. Develop an ASM program for µP 8085 which sets the C register to 1 if the MSB or LSB of the number at memory location 8100h is ‘1’ else sets C register to 0.
4. Develop a subroutine for µP 8085 to find the factorial of the number passed to it through the B register.
5. Develop a program for µP 8085 to convert a two digit packed BCD number in register A to unpacked BCD format in BC register pair.
6. Develop a program for µP 8085 to generate a square wave in SOD line.
7. Develop a program segment for µP 8085 to mask RST5.5 and enable the rest.
8. Write notes on the ALE and READY lines of µP 8085.
9. State the advantage of relative branching available in Z80 over absolute branching.
10. Develop an ASM program for µP Z80 to input 40 bytes from I/O port 30h and to store them from 8100h using string primitives.

 

PART – B

11. Sketch neat circuit diagrams of Op-amp based inverting and non-­inverting amplifiers. Also derive expressions for their voltage gains. (6+6.5)
12. With timing diagram, explain the instruction cycle for LXI H,FFFFH of µP 8085.
13. If the crystal frequency of an 8085 system is 1 M.Hz, calculate the delay generated by the following segment of code.

MVI A,50H

rpt:       DCR A

JNZ rpt

14. Write notes on the software and hardware interrupts available in µP 8085.
15. Explain the various block transfer and block search instructions available in µP Z80.

 

PART – C

16. Develop an interface and program for µP 8085 to implement an 8 bits successive approximation A/D converter.
17. Develop a program for µP 8085 to solve ⁿ¹C_r1 – ⁿ²C_r2 . Use a subroutine for factorial.
18. There are eight LEDs and two switches (S₀ and S₁) connected to ports, PA and PB respectively. Develop an ASM program for mP 8085 to generate the following pattern.

S1	S0	LEDs
0	0	OFF
0	1	Binary Ascending
1	0	Left to Right
1	1	All Blinking

 

19. Explain memory mapped I/O and I/O mapped I/O schemes of m Also explain with a neat circuit diagram how I/O mapped I/O scheme can be implemented with address decoding for 2 ROM chips of 8KB each and 6 RAM chips of 8KB each. (6+6.5)
20. Develop a program for Z80 to copy the elements of an array into an overlapping array.

 

 

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