DEPARTMENT OF INFORMATION TECHNOLOGY
Subject Code :EC8691
Subject Name : Microprocessors and
Microcontrollers
Subject In – Charge : P.Ramalakshmi AP/ECE
Class : III IT / V
QUESTION BANK
UNIT I
THE 8086 MICROPROCESSOR
Introduction to 8086 – Microprocessor architecture – Addressing modes - Instruction set
and assembler directives – Assembly language programming – Modular Programming Linking and Relocation - Stacks - Procedures – Macros – Interrupts and interrupt service
routines – Byte and String Manipulation.
Q.
No
Question
Marks
Allotted
Knowled
ge Level
Number
of Times
in AU
2
K1
1
2
K2
1
2
K1
1
2
K1
1
2
K1
2
PART – A
Introduction to 8086
1.
What is Tristate bus? Nov/Dec-2014
2.
Calculate the physical address, when segment address is 1085
H and effective address is 4537 H. Nov/Dec-2016
3.
List the segment registers of 8086. Nov/Dec-2016
4.
Define Stack Pointer. Apr/May-2018
5.
Define stack. Apr/May-2016, Apr/May-2017
6.
List the flags of 8086 microprocessor. Nov/Dec-2016,
Apr/May-2016, Apr/May-2014
2
K1
3
Why is the 8086 memory divided into odd and even banks?
Nov/Dec-2013
2
K2
1
What do you mean by Segment Override Prefix? Nov/Dec2013
2
K1
1
What are the advantages of memory mapped I/O over I/O
mapped I/O? Apr/May-2014
2
K1
1
List the addressing modes of 8086. Give examples.
Apr/May-2015
2
K1
1
7.
8.
9.
10.
11.
12.
13.
Instruction set and assembler directives
What is an assembler? Nov/Dec-2014
2
K1
1
List the modes of operation in 8086. Nov/Dec-2017,
Apr/May-2018
2
K1
2
What are the 8086 instructions used for ASCII arithmetic?
Nov/Dec-2013
2
K1
1
2
K1
1
2
K2
1
2
K1
1
2
K1
1
14.
Define Macros. Nov/Dec-2017
15.
The offset address of a data is (341B) H and the data segment
register value is (123A)H. What is the physical address of the
data? Apr/May-2017
16.
What is direct memory access? Nov/Dec-2014
17.
What are byte and string manipulations? Nov/Dec-2018.
18.
Show how the 2 byte INT instruction can be applied for
debugging. Nov/Dec-2015
2
K2
1
What are the 8086 instructions used for BCD arithmetic?
Apr/May-2013
2
K1
1
2
K2
1
19.
20.
What are the contents of AL and CY after the execution of
the following segment? Apr/May-2013
MOV BL, D5H
RCL BL, 3
MOV AL, BL
21.
Briefly describe the term Macros.
22.
Write about modular programming.
2
K1
23.
Explain the Linking Process.
2
K2
24.
Interrupts and Interrupt Service Routine
What is the need for interrupts in Microprocessor operation?
2
Nov/Dec-2018
25.
26.
Write about the different types of interrupts supported in
8086. Apr/May-2015
2
K2
K1
2
K1
2
K1
-
1
1
List the various string instructions available in 8086.
Nov/Dec-2013
1
27.
Why is 8284 clock generator connected to the 8086 CLK
pin? Apr/May-2013
2
K2
10 and 8
K2
2
8
K2
1
K2
1
13
K2
4
13
K2
5
13
K2
1
Instruction set and assembler directives
Write a short note about assembler directives. Nov-Dec 2016
3
K2
1
Explain the Data transfer, arithmetic and branch instructions
with examples. Nov-Dec 2016
8
K2
1
Develop an 8086 ALP to find the sum of numbers in an array
of 10 elements. Nov-Dec 2016
7
K3
1
Develop an 8086 assembly language program to convert
BCD data – Binary data Nov-Dec 2016
8
K3
1
Explain about the Assume, EQU, DD assembler directives.
Nov-Dec 2015
8
K2
1
Develop an 8086 assembly language program to check
whether the given string is palindrome or not. Nov-Dec 2015
8
K3
1
Briefly explain the arithmetic group of instructions available
in 8086 microprocessor. Nov-Dec 2014
7
K2
1
Briefly explain the assembler directives of 8086. Nov-Dec
2014
7
K2
1
1
PART B
28.
Introduction to 8086
Explain the internal hardware architecture of 8086
microprocessor with neat diagrams.
Nov-Dec 2016, Apr/May-2015
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
Describe the functions of Execution unit and Bus interface
unit. Apr/May-2014
Briefly describe about addressing modes of 8086. Apr/May2015
Explain the various addressing modes available in 8086.
Explain each mode with an example. Nov/Dec-2018,
Apr/May-2016,Apr/May-2016, Apr/May-2015
With a neat block diagram, explain the architecture of 8086
Microprocessor. Apr/May-2018, Nov/Dec-2017, Apr/May2017,Nov-Dec 2016, Nov-Dec 2015
For 8086 microprocessor what are the instruction set and
assembler directives. Nov/Dec-2018
8
42.
43.
The data transfer rate of I/O device ‘A’ is considerably less
that of the microprocessor. Draw a flow chart of data transfer
operation to be used. Apr/May-2014
8
K3
1
K2
5
5
K2
1
6
K3
1
K3
-
K2
-
K3
-
K3
-
K3
-
K3
-
Interrupts and Interrupt Service Routine
Explain about Interrupt and Interrupt Service Routine in
8086. Apr/May-2018, Nov/Dec-2017, Apr/May-2017,Nov13
Dec 2015, Apr/May-2015
44.
Write notes on Interrupt processing Apr/May-2014
45.
Develop a program to transfer 10 bytes of data from memory
location starting from 2000H. Apr/May-2014
PART C
46.
47.
48.
49.
50.
51.
Assembly language programming
Develop an algorithm and write ALP for sort a given array
Ascending and Descending order with array of length 10
15
using 8086 Microprocessor.
What do you mean by assembler directives? Explain
7
SEGMENT, TYPE and OFFSET with suitable examples.
Summarize an 8086 ALP to compare two strings of same
8
length.
Develop an assembly language program for performing
the Multiplication and Division of 16 bit numbers using
15
8086 Microprocessor.
Design an ALP in 8086 to multiply two 16-bit numbers.
10
Develop an assembly language program for ASCII to HEX
code conversion using 8086.
5
UNIT II
8086 SYSTEM BUS STRUCTURE
8086 signals – Basic configurations – System bus timing –System design using 8086 – IO
programming – Introduction to Multiprogramming – System Bus Structure Multiprocessor configurations – Coprocessor, Closely coupled and loosely Coupled
configurations – Introduction to advanced processors.
Q.
No
Marks
Allotted
Question
Knowled
ge Level
Number
of Times
in AU
K1
1
PART – A
8086 Signals and Configurations
52.
What is the need of lock signal? April/May2017
2
53.
Define machine cycle? November /December2016
54.
Define Bus? November /December2016
55.
56.
57.
58.
2
K1
1
2
K1
1
Differentiate External verses Internal bus ? May
/June2016
2
K2
1
Define bus .why bus request and cycle stealing are
required? April/May2015
2
K2
1
Draw the read cycle timing diagrams for minimum
mode. April/May2015
2
K2
1
2
K1
1
2
K1
-
2
K1
-
59.
What is direct memory access? Nov/ Dec-2014
What is virtual memory addressing?
60.
State the queue status of QS1 and QS0.
61.
Draw the timing diagram of Interrupt acknowledgement
minimum mode system.
2
K2
-
What is meant by multiprogramming?
April/May2017,November/December 2015
2
K1
2
System Bus Structure
Write some example for advanced processors.
April/May2017, November /December2017
2
K1
2
Compare closely coupled and loosely coupled
configuration? May /June2016
2
K2
1
Schematically show, how synchronization is made
between 8086 and co-processor. Nov /Dec 2015
2
K2
1
2
K2
1
2
K2
1
2
K1
-
2
K2
-
2
K1
-
2
K2
-
62.
63.
64.
65.
66.
When the co-processor is used? Nov /Dec 2018
67.
Why memory interfacing is required? November
/December2018
68.
Discuss about Semaphore.
69.
How does the main processor distinguish its instructions
from the co-processor instructions when it fetches the
instructions from memory?
Mention the bus allocation schemes in multiprocessor
Configurations
Show your understanding on bus request, bus Grant and
Stealing?
70.
71.
PART B
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
8086 Signals and Configurations
Explain in the details about the system bus timing of
8086/8088. November /December2016, May
13
/June2016
K2
2
13
K2
1
13
K2
1
13
K2
1
K2
-
Explain the following May /June2016
i)
Microprocessor system
ii)
Coprocessor
iii)
Multiprogramming
iv)
Semaphore
With neat diagram explain the minimum modes of
operation of 8086? November /December2015
Discuss the maximum mode configuration of 8086 by
with a neat diagram. Mention the function of various
Signals. April/May2015
Identify the following:
(i) Programmed I/O
7
(ii) Interrupt I/O
6
System Bus Structure
Discuss about the multiprocessor configuration of 8086.
November /December2016
13
K2
1
13
K2
2
What do you understand from system bus structure?
Explain. November /december2018
7
K2
1
Explain the closely looped configuration with neat
diagram? Apr/May2017, Nov/Dec2017, Nov /Dec2018
8
K2
1
Define loosely coupled System .Explain the schemes
used for establishing priority. Nov /Dec2015
8
K2
1
K2
-
Explain the system bus structure of 8086. Draw the
timing diagram for interrupt acknowledgement cycle?
April/May2017, November /December2017
Design the block diagram of Polling method.
Draw the block diagram of daisy chaining method and
explain.
PART C
6
7
System Bus Structure and Advanced Processors
83.
i)Write down the comparison of minimum mode and
maximum mode pins.
K2
-
15
K2
-
Assess the various schemes used to solve the bus
arbitration problem in multiprocessors.
15
K2
-
With necessary illustrations write the execution step of
8087 Coprocessor.
8
K2
-
ii)Draw the timing diagram for the execution of the
8086 MOV instructions.
84.
85.
86.
8
Summarize the timing diagram of memory read and
memory, write the operations of 8086 microprocessor
and explain in detail.
Explain the architecture of 80286.
7
7
UNIT III
I/O INTERFACING
Memory Interfacing and I/O interfacing - Parallel communication interface – Serial
communication interface – D/A and A/D Interface - Timer – Keyboard /display controller
– Interrupt controller – DMA controller – Programming and applications Case studies:
Traffic Light control, LED display, LCD display, Keyboard display interface and Alarm
Controller.
Q.
No
Marks
Allotted
Question
Knowled
ge Level
Number
of Times
in AU
PART – A
Memory and I/O interfacing, Serial, Parallel, D/A and A/D
87.
88.
89.
What is the drawback of memory mapped I/O? Nov/Dec2016.
Give the various modes of 8254 timer. Apr/May 2018
Write the 16-bit delay program in 8086. Apr/May 2018,
Apr/May 2017
2
K1
1
2
K1
1
2
K2
2
2
K2
1
90.
Why is memory interfacing required? Nov/Dec 2018
91.
List the four display modes of 8279 keyboard and
display controller
2
K1
-
List the advantages and disadvantages of parallel
2
K1
1
92.
communication over serial communication.
Apr/May 2016
93.
What is key bouncing? Apr/May 2016, Nov/Dec 2014
2
K1
2
94.
List the operating modes of 8255 A and 8237 A.
Nov/Dec 2015
2
K1
1
2
K2
1
2
K1
1
DMA controller and Traffic Light controller
What are the differences between LED display and LCD
2
display. Nov/Dec 2018
K1
1
What is sample and hold circuit? Nov/Dec 2014
2
K1
1
2
K1
1
2
K1
-
2
K2
-
2
K2
-
2
K2
-
2
K1
1
2
K2
1
2
K2
1
Memory and I/O interfacing, Serial, Parallel, D/A and A/D
107. How are D/A and A/D interfaces used? Explain.
13,16
K2
3
95.
96.
97.
98.
What frequency transmit clock (TxC) is required
by an 8251 in order for it to transmit data at 4800
baud with a baud rate factor of 16? Nov/Dec 2015
Give the various modes and applications of 8254 timer?
Apr/May 2015
99.
State the significance of using microprocessor in
interfacing traffic light control. May/June 2014
100. State your idea on the different types of command
words used in 8259?
101. Evaluate your opinion on the operating modes of
8259A?
102. Elaborate the purpose of control word written to control
register in 8255.
103. Invent how many address lines and data lines are
necessary for accessing 32K X 8 memory?
104. What are the handshake signals used in Mode 2
configurations of 8255. Nov/Dec 2017
105. How the DMA operation performed in 8086? Nov/Dec
2017
106. Draw the format of read back command register of
8254. April/May2017
PART B
Nov/Dec 2018, April/May2015, Nov/Dec 2013
108. Draw and Explain functional diagram of 8251.
Nov/Dec 2017 , Nov/Dec 2015
109. Draw the block diagram and explain the operations of
USART April/May2018
110. Discuss about memory and I/O interfacing.
111. With a block diagram design how 8255 functions in
different modes to accommodate different kind of I/O
devices.
112.
Briefly explain the method of interfacing A-to-D
converter with microcontroller. Nov/Dec 2014
113. Write notes on Programmable Interval Timers 8253
and 8254. April/May2014, Nov/Dec 2014
13,16
K2
2
7
K2
1
6
K2
-
5
K3
-
K2
8
1
K2
8
DMA controller and Traffic Light controller
114. What are interrupt controller and DMA controller?
Explain Nov/Dec 2018, April/May2018, Nov/Dec
13
2016, April/May2016
2
K2
4
13,16
K2
3
16
K2
1
16
K2
2
K3
2
115. Draw and explain functional diagram of keyboard
and display controller. Nov/Dec 2017, Nov/Dec
2015, April/May2014
116. Draw the block diagram of alarm controller with 8086
as processor. April/May2015
117. With neat block diagram explain the 8255 programmable
Peripheral Interface and its operating modes. Nov/Dec
2013, May/June 2014
PART C
System Bus Structure and Advanced Processors
32.
Develop a 8086 based system to display the word
HELLO for every 2 ms in the common cathode seven
segment LED display and check how many times the
word displayed for one hour. Nov/Dec 2017,
April/May2017
15
33.
34.
35
Draw the block diagram of traffic light control system
using 8086. April/May2018
15
K2
1
Write the algorithm and assembly language program for
traffic light control system. April/May2018
15
K3
1
Discuss the various operating modes of 8253 timer with
necessary control words.
15
K2
-
UNIT IV-MICROCONTROLLER
Architecture of 8051 – Special Function Registers(SFRs) - I/O Pins- Ports and Circuits Instruction set - Addressing modes - Assembly language programming.
Q.
No
Knowled
ge Level
Number
of Times
in AU
2
K2
1
2
K2
1
Which port used as multifunction port? List the
signals. April/May2017
2
K1
1
Draw the pin diagram 8051. Nov/Dec2016,
April/May2018
2
K1
2
2
K1
1
Mention the number of register banks and their
addresses in 8051.Nov/Dec2015
2
K1
1
Draw the diagram for processor status word in 8051.
April/May2015
2
K1
1
How do you select the register bank in 8051
microcontroller? April/May2015, April/May2013
2
K2
1
2
K3
1
2
K1
1
Marks
Allotted
Question
PART – A
Architecture of 8051, SFRs, IO pins and Ports
118.
119.
120.
121.
122.
123.
124.
125.
126.
127.
How Microcontroller is different from Microprocessor?
Nov/Dec-2018.
How to set 8051 in idle mode? Nov/Dec2017
What is the significance of EA pin? Nov/Dec2016
How the processor 8051 does know whether on-chip
ROM or external program memory is used?
April/May2014
List the SFRs involves in interrupt programming of
8051. Nov/Dec2014
128.
129.
130.
131.
132.
133.
Why it is necessary to have external pull- up for port 0
in 8051? Nov/Dec2014
Which of the 8051 ports need pull-up registers to
functions as an I/O port? Nov/Dec2013
Specify the size of memory systems used in 8051
microcontroller. Nov/Dec2012
2
K2
1
2
K2
1
2
K1
1
2
K2
1
Instruction set, Addressing modes and ALP
What are the addressing modes of a Microcontroller?
2
Nov/Dec-2018.
K1
1
Illustrate the DJNZ operation instruction. Nov/Dec
2017
2
K2
1
2
K1
1
2
K2
1
2
K3
1
2
K1
1
2
K2
1
2
K2
1
2
K1
1
2
K1
1
Architecture of 8051, SFRs, IO pins and Ports
Discuss the ports and its circuits of 8051 Nov/Dec
2017
13
K2
1
Give PSW of 8051 and describe the use of each bit in
PSW. Nov/Dec 2015
K2
1
How many ports are bit addressable in 8051 µ c?
Nov/Dec2011
134.
Illustrate the CJNE instruction. April/May2017
135.
What is the different ways of operand
addressing in 8051? April/May2016
Write the 8051 ALP to toggle P1 a total of 200 times.
Use RAM locations 32H to hold your counter value
instead of register R0-R7 May/June 2016
136.
137.
What is the jump range? Nov/Dec2015
138.
What is the difference between AJMP and LJMP
instruction? April/May2014
How do you place a specific value in the DPTR
register? Nov/Dec2013
Mention the different operand types used in 8051
microcontroller. Nov/Dec2012
What are the hardware and software interrupts of 8051
µ c? Mention its vector addresses. Nov/Dec2011
139.
140.
141.
PART B
142.
143.
8
144.
145.
146.
How input/output pins and ports help in a circuit of a
microcontroller? Nov/Dec 2018
Write the available special function registers in 8051.
Explain each register with its format and function?
Nov/Dec 2015, April/May2017, Nov/Dec 2018
13
K2
1
16,13
K2
3
Explain in detail about the architecture of 8051
microcontroller with neat diagram. April/May2015,
May/June2016, Nov/Dec 2016, Nov/Dec 2017,
8,16,13
K2
5
April/May2018
147.
148.
149.
K2
Explain the TMOD function register and its timer
modes of operations. April/May2015
8
K2
Describe the function of the following signals in
8051.RST, EA, PSEN and ALE. Nov/Dec2015
Explain in detail the memory organization of 8051
microcontroller. Nov/Dec2014
1
8
1
K2
16
1
Instruction set, Addressing modes and ALP
150.
151.
152.
153.
154.
155.
156.
Discuss the type of addressing modes with suitable example
in 8051. Nov/Dec 2015, April/May2017, April/May2018
8,13
K2
3
Write an 8051 assembly language program to multiply the
given number 45H and 30H. April/May2017
5
K2
1
Explain about Arithmetic and control instruction
set in 8051.April/May2015
10
K2
1
Write a program to bring in data in serial form and
send it out in parallel for using 8051. April/May2015
6
K3
1
Write an ALP using 8051 instruction to receive bytes
of data serial and put them inp1.Set the baud rate at
4800, 8-bit data and 1 stop bit. Nov/Dec2016
Write an 8051 ALP to create a square wave of 66%
day cycle on bit 3 port1.May/June2016
K3
16
1
K3
16
Write an assembly language program for 8051 to find
largest of three numbers.
PART C
Assembly language programming
1
K3
8
-
157.
158.
159.
160.
Summarize block diagram how to access external
memory devices in an 8051 based system.
8
K2
-
Explain the Boolean processing capabilities of an 8051
microcontroller.
7
K2
-
Write a brief note on external data move operations in
8051.
8
K3
-
7
K3
-
Write an 8051 ALP to add three BCD numbers stored
in internal RAM locations 25H, 26H and 27H and put
the result in RAM locations 31H (MSB) and 30H
(LSB). Use Register R0 to store the intermediate
result.
UNIT V
INTERFACING MICROCONTROLLER
Programming 8051 Timers - Serial Port Programming - Interrupts Programming – LCD &
Keyboard Interfacing - ADC, DAC & Sensor Interfacing - External Memory InterfaceStepper Motor and Waveform generation - Comparison of Microprocessor,
Microcontroller, PIC and ARM processors
Q.
No
Question
Marks
Allotted
Knowled
ge Level
Number
of Times
in AU
2
K1
3
2
K1
1
2
K1
1
2
K1
1
2
K3
1
2
K2
1
2
K1
1
PART – A
Programming 8051 Timers
161. List the 8051 interrupts with its priority. Nov/Dec 2017,
April/May 2017, April/May 2018
162. Give two example of sensors and state its uses. Nov/Dec
2017
163. What are the types of sensors used for interfacing?
April/May 2017, April/May 2018
164. List the modes of timer in 8051. Nov/Dec 2016
165. State how baud rate is calculated for serial data transfer
in mode 1. Nov/Dec 2016
166. Compare polling and interrupt. May/June 2016
167. Define baud rate. May/June 2016
168. Mention the features of special ports in mode 0.
Nov/Dec 2015
2
K1
1
2
K1
1
2
K2
1
2
K2
1
2
K2
1
2
K1
1
2
K2
-
2
K2
1
interfacing traffic light control. May/June 2014
177. Mention the advantages of microprocessor based system
design.
2
K2
1
K2
-
178. List out the classifications of stepper motor.
2
K1
-
179. How to change the stepper motor direction?
2
K2
-
180. What is the use of stepper motor?
2
K1
-
K2
3
169. What is jump range? Nov/Dec 2015
170. Differentiate between timer and counter. Draw the
diagram of TCON in 8051. April/May 2015
Which register is used for serial programming in 8051?
Illustrate it. April/May 2015
172. How to program 8051 timers? Nov/Dec 2018
171.
173. What are the types of ADC? Nov/Dec 2018
Stepper Motor and Waveform generation
174. Illustrate the idea behind motor control using PWM.
175. Write about the design steps involved in using
microcontroller for stepper motor. May/June 2014
176. State the significance of using microprocessor in
2
PART B
Programming 8051 Timers
181. Illustrate the serial communication in 8051, with its
special function register. May/June2016,Nov/Dec
16,13
2017, Nov/Dec2018
182. Interface the ADC converter with 8051 and explain with
neat diagram. Nov/Dec 2017
7
K3
1
183. Write the assembly language program to execute the
ADC conversion. Nov/Dec 2017
6
K3
1
16,13
K2
3
184. Describe the different mode of operation of
timer/counter in 8051 microcontroller with its associated
registers. April/May2015,/Dec 2016, April/May2018
185. Draw a diagram to interface a stepper motor with 8051
micro controller also write an 8051 ALP to run the
stepper motor in both forward as reverse direction.
Nov/Dec2015,Nov/Dec 2016, May/June2016,
April/May2018
186. With a neat circuit diagram explain how a 4 x 4 keypad
is interfaced with 8051 microcontroller and write 8051
ALP for keypad scanning. Nov/Dec2015
187. How does one interface a 16 x 2 LCD Display using
8051 microcontroller? April/May2015
188. Draw the diagram to interface a stepper motor with 8051
microcontroller and explain. Write a 8051 language
program to run the stepper motor in both forward and
reverse direction with delay. April/May2015
189. What are sensor interfacing and external memory
interfacing? Explain. Nov/Dec2018
16,13
K3
4
16
K3
1
16
K3
1
16
1
K3
13
190. Write a program using 8051 assembly language to add
three BCD numbers stored in internal RAM locations
25H, 26H and put the result in RAM locations 31H and
30H. Use register R0 to store the intermediate result.
7
K2
K3
1
-
PART C
Assembly language programming
191. Write a program for generation of unipolar square
waveform of 1 kHz frequency using Timer0 of 8051 in
mode0. Consider the system frequency are 12Mhz.
April/May2017, Nov/Dec 2017
15
K3
2
15
K3
1
8
K2
-
7
K2
-
8
K2
-
192. How Microprocessor and Microcontroller can help to
control a process or a machine tool? Nov/Dec 2018
193. Explain how an LCD and Keyboard is interfaced with
8051.
194. Write about serial port interface of 8051 in detail.
195. Generalize the different methods of memory address
decoding in 8051 microcontroller.
196. 3Develop an 8051 program to monitor P1 continuously the
value 63H. It should get out of the monitoring only if
P1=63H.
7
K3
-
15
K3
1
15
K3
-
197. Demonstrate the interfacing of stepper motor with
8051and explain its interfacing diagram and develop
program to rotate the motor in clockwise direction.
April/May2017
198. You are provided with 4x4 matrix key board, a
microcontroller and a seven segment display. Design a
system which has to display the hexadecimal code of the
corresponding key pressed. Assume all other relevant
details. Give a program for your design.