MPU Past PPRX
MPU Past PPRX
MPU Past PPRX
Marks
01.
What are the basic units of Microprocessor?. Describe the internal architecture of
MOTOROLLA 6800 microprocessor along with address bus, data bus and control bus.
Also compare the Compatibility of 6800 with 6502 as well.
[16]
(a)
What is the use of the flags in microprocessor? and how the flags are affected? With the
help of examples define all the flags of 8088 p.
[08]
(b)
256 bytes of data are stored at memory location starting from 2000 to 20FF. Show the
Program that will copy the given 256 bytes of data and save at the memory location
Starting from 3000 to 30FF (8085 p)
[08]
(a)
With the help of necessary diagrams discuss the concept of fetch, read and write cycle
of microprocessor.
[05]
(b)
Calculate time-delay to execute instruction MVI A, 06h @ f = 2 MHz & f = 3.125 MHz
[05]
(c)
Write a program to add two 16-bit numbers 20FAH and 3F1CH, and store the result in
20AC H memory location (8085p).
[06]
04.
Explain in detail, how the grouping of instructions has been done for 8085 p. Explain
any three instructions from each grouping with examples, while indicating the values of
registers before and after each execution.
[16]
05.
02.
03.
Contd on P/-2
(-2-)
06 (a) What is PLC? Draw and describe its basic structure and various modes of operation. Give
advantages of PLCs over magnetic contactor .
[08]
(b) How the analogue inputs are interfaced with microprocessor? With the help of circuit diagram [08]
discuss the digital to analogue ( A/ D ) interfacing.
07. (a) What is pipelining process of 8086-8088 Microprocessor? How 20-bit Address is obtained by using
the segment registers?
[08]
(b) What is Micro Controller? Explain how Micro Controller are used in domestic appliances? Also
draw simplified structure.
[08]
08.
The traffic signal lights on a main road show green for 20 seconds , yellow for 30 seconds
and red for 48 seconds. Bits 0 , 1 and 2 of port 4 are control inputs to peripheral equipment,
that runs these traffic lights . write a program that produces a time delay of 20, 30 and 48
Seconds for the traffic lights.
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[16]
ID.No./Seat No.
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY,
JAMSHORO.
FIRST TERM FINAL YEAR (7TH TERM) B.E.(ELECTRICAL) REGULAR
EXAMINATION 2011 OF 08-BATCH.
MICROPROCESSOR SYSTEMS
Dated: 28-05-2011.
Time Allowed: 03 Hours.
Max.Marks-80.
NOTE: 1. ATTEMPT ANY FIVE QUESTIONS.
2. Copies of Intel 8085 & MC6800 Instruction Set are provided with the question paper.
Q.No.
01.
02 (a) Draw the internal functional block diagrams of the Z80, and Intel 8085 P.
(b) Explain the functions of the following pins of 8085 microprocessor.
1. HLDA
2. X1, X2
3. SOD
4. AD0-AD7 5. ALE
6. INTR
03.
Explain in detail, how the grouping of instructions has been done for the 8085 P.
Explain any four instructions from each grouping with examples while indicating the
values of registers before and after each execution.
Cont d on P/-2.
(-2-)
04 .
Emergency alarm
DELAY:
SECOND:
LOOP:
LXI
MVI
OUT
MVI
CALL
MVI
OUT
MVI
CALL
MVI
OUT
MVI
CALL
JMP
PUSH
PUSH
LXI
DCX
MOV
ORA
SP, XX99
A, 41H
PORT #
B, 0FH
DELAY
A, 84H
PORT #
B, 05H
DELAY
A, 90H
PORT #
B, 14H
DELAY
START
D
PSW
D
D
A, D
E
JNZ
DCR
JNZ
POP
POP
RET
LOOP
B
SECOND
PSW
D
Contd on P/-3..
(-3-)
68HC11 Microcontroller
(b)
P L C system
(c)
(d)
(e)
------------------THE END-----------------
ID.No./Seat No.
Marks
Describe the major components of Microprocessor system. Discuss the internal [16]
architecture of INTELL 8085 microprocessor and also describe all types of
registers along with flags in the status register. Also compare the Compatibility
of 8085 with 8080 as well.
02 (a) Specify the register contents and flag status (S, Z, CY) after the instruction ORA A is
executed in Intel 8085 P.
[08]
MVI A, B9H
MVI B, 47H
ADD B
ORA A
(b) Explain why demultiplexing is done for bus AD7 AD0 in 8085 P.
03
[08]
What is the use of ADDRESSING MODE in any microprocessor and why these are
important for microprocessor? With the help of examples discuss the following. [16]
(i) Direct addressing mod
................................................................... 8085 p
(ii) Zero-page Addressing mode of .............................................................. 6502 p
(iii) Relative Addressing mode .......................................................................6800 p
(iv) Absolute Addressing mode
........................................................... 6502 p
04 (a) Define an Interrupt. What are the address lines for hardware and software
interrupts?
(b) What is SIM and RIM instructions? With the help of flow-chart explain the
operation of these instructions.
[08]
[08]
05 (a) With the help of timing diagram discuss the concept of fetch, read and write cycle of
p.
[05]
(b) How the microprocessor know what operation to perform first (READ/WRITE
memory or READ/WRITE I /O)? and how does the microprocessor differentiate b/w
positive number Negative number or bit pattern?
[06]
(c) Write a program to add four numbers. The numbers are 23, 26 , 34 and 48 in memory
location 5015, 5025 and 5050 and 5070 respectively. Store the sum of four numbers
at memory location 5095 and 5096 for 6800p.
[05]
06 (a) What is PLC?
[04]
(b) Draw the functional block-diagram of PLC system hardware.
[06]
(c) Describe memory structure and various modes of operation of PLC system.
[06]
Contd on P/-2
(-2-)
07
What do you mean by Microcontroller Explain the essential features of Intel 8051,
and Motorola M68HC11 microcontroller. Give prototype applications in Washing
machines.
[16]
08 (a) A Railway crossing signal has two flashing lights run by a microcontroller. One light is
Connected to data bit D1, and the second light is connected to data bit D2. Write a
program in assembly to turn each signal light alternately ON an OFF at the interval of
1 second, if system frequency is 2 MHz.
[10]
(b) A microcomputer is designed to control various appliances in your house; the system
has Output port # 03H and various units are connected to bits D7 to D0 as shown in
figure-01. For a cool morning you want to turn ON the Radio, the Coffeepot and
electric oven. Write appropriate instruction for micro-controller (8085p) .
[06]
Figure 01
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