LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – PHYSICS
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FIRST SEMESTER – NOV 2006
PH 1808 – ELECTRONICS – I
Date & Time : 31-10-2006/1.00-4.00 Dept. No. Max. : 100 Marks
PART – A
- Draw the circuit diagram of an Integrator using an operational amplifier.
- State any two advantages of a R-2R D/A converter over a binary weighted D/A converter.
- 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.
- Develop a subroutine for µP 8085 to find the factorial of the number passed to it through the B register.
- 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.
- Develop a program for µP 8085 to generate a square wave in SOD line.
- Develop a program segment for µP 8085 to mask RST5.5 and enable the rest.
- Write notes on the ALE and READY lines of µP 8085.
- State the advantage of relative branching available in Z80 over absolute branching.
- 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
- Sketch neat circuit diagrams of Op-amp based inverting and non-inverting amplifiers. Also derive expressions for their voltage gains. (6+6.5)
- With timing diagram, explain the instruction cycle for LXI H,FFFFH of µP 8085.
- 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
- Write notes on the software and hardware interrupts available in µP 8085.
- Explain the various block transfer and block search instructions available in µP Z80.
PART – C
- Develop an interface and program for µP 8085 to implement an 8 bits successive approximation A/D converter.
- Develop a program for µP 8085 to solve n1Cr1 – n2Cr2 . Use a subroutine for factorial.
- 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 |
- 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)
- Develop a program for Z80 to copy the elements of an array into an overlapping array.
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