EE6612-MICROPROCESSOR-AND-MICROCONTROLLER ...

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EE6612 MICROPROCESSOR AND MICROCONTROLLER LABORATORY

1

Dharmapuri – 636 703 For more Visit : www.EasyEngineering.net

LAB MANUAL

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Regulation Branch

: 2013 : B.E. - EEE

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Year & Semester

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: III Year / VI Semester

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EE6612-MICROPROCESSOR AND MICROCONTROLLER LAB

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ICAL ENG

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DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING


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ANNA UNIVERSITY: CHENNAI REGULATION - 2013 SYLLABUS EE6612 MICROPROCESSOR AND MICROCONTROLLER LABORATORY OBJECTIVES:

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To provide training on programming of microprocessors and microcontrollers and understand the interface requirements.

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LIST OF EXPERIMENTS:

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1. Simple arithmetic operations: addition / subtraction / multiplication / division. 2. Programming with control instructions: (i) Ascending / Descending order, Maximum / Minimum of numbers (ii) Programs using Rotate instructions (iii)Hex / ASCII / BCD code conversions. 3. Interface Experiments: with 8085 (i) A/D Interfacing. & D/A Interfacing. 4. Traffic light controller. 5. I/O Port / Serial communication 6. Programming Practices with Simulators/Emulators/open source 7. Read a key, interface display 8. Demonstration of basic instructions with 8051 Micro controller execution, including: (i) Conditional jumps, looping (ii) Calling subroutines. 9. Programming I/O Port 8051 (i) study on interface with A/D & D/A (ii) study on interface with DC & AC motor . 10. Mini project development with processors. TOTAL: 45 PERIODS

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3

INDEX EX.NO

DATE

NAME OF THE EXPERIMENT

1

PROGRAM FOR 8 BIT ADDITION USING 8085

2

PROGRAM FOR 8 BIT SUBTRACTION USING 8085

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PROGRAM FOR 8 BIT MULTIPLICATION USING 8085

5

PROGRAM TO FIND THE LARGEST NUMBER IN GIVEN ARRAY USING 8085

3

w.E

4

PROGRAM FOR 8 BIT DIVISION USING 8085

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En

6

PROGRAM TO FIND THE SMALLEST NUMBER IN GIVEN ARRAY USING 8085

7

PROGRAM FOR SORT ASCENDING ORDER USING 8085

8

PROGRAM FOR SORT DESCENDING ORDER USING 8085

9

PROGRAM FOR CODE CONVERSION OF HEX TO DECIMAL

10

PROGRAM FOR CODE CONVERSION OF DECIMAL TO HEX

11

PROGRAM FOR CODE CONVERSION OF BINARY TO ASCII

12

PROGRAM FOR CODE CONVERSION OF ASCII TO BINARY

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STAFF SIGN REMARKS

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EX.NO

DATE

NAME OF THE EXPERIMENT

13

PROGRAM FOR INTERFACING OF ADC WITH 8085

14

PROGRAM FOR INTERFACING OF DAC WITH 8085

15

PROGRAM FOR INTERFACING OF SERIAL PORT COMMUNICATION WITH 8085

16

PROGRAM FOR INTERFACING OF KEYBOARD AND DISPLAY WITH 8085

17

PROGRAM FOR INTERFACING OF TRAFFIC LIGHT CONTROLLER WITH 8085

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STAFF SIGN REMARKS

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asy

PROGRAM FOR 8 BIT ADDITION USING 8051

18

En

19

PROGRAM FOR 8 BIT SUBTRACTION USING 8051

20

PROGRAM FOR 8 BIT MULTIPLICATION USING 8051

21

PROGRAM FOR 8 BIT DIVISION USING 8051

22

PROGRAM FOR INTERFACING OF ADC WITH 8051

23

PROGRAM FOR INTERFACING OF DAC WITH 8051

24

PROGRAM FOR INTERFACING OF STEPPER MOTOR WITH 8051

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5

Ex No : 1 Date

: PROGRAM FOR 8 BIT ADDITION USING 8085

AIM: To write an assembly language program for addition of two 8 bit data using 8085 microprocessor.

APPARATUS REQUIRED: Sl.No

Name of the Apparatus

Qty

1

8085 Microprocessor kit

1

2

+5Volts Power Supply

1

ww 3

w.E

Keyboard Connector

ALGORITHM:

1

asy

1. Clear the register C

En

2. Initialize the memory pointer to data location.

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3. Get the first Data from memory Location and move to register A. 4. Get the second data from memory location. 5. Add first and second data.

6. If carry the increment the register C by one. 7. Store the result to memory location.

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6

FLOW CHART: (8 bit Addition) START

Clear the “C” Register

Initialize Memory Location and get the first data from memory

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Get the Second data from memory Location

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ge

ge

asy

Add the first and Second data’s

En

If carry=1?

Yes

NO

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Increment “C” register by One

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ge

VVIT

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Store the Result to Memory Location

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STOP



7

PROGRAM:

ADDRESS

LABEL

8000

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w.E Loop1

MNEMONICS

OPCODE

COMMENTS

MVI C,00


LXI H,9200

Initialize the memory pointer

MOV A,M

Move the First Data to A Register

INX H

Increment the memory pointer

ADD M

Add First and Second Data

JNC LOOP1

Jump if No Carry to loop1

INR C

Increment the “C” register by one

STA 9500

STA 9501

Store the Result Move the Carry result to Register “A” Store the Carry Result

HLT

Stop the program

asy

MOV A,C

En

Input: Memory location

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Data

9200 9201

Output: Memory location 9500

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Data

9501

Result : Thus the addition of two 8 bit data’s was executed using the 8085 microprocessor. VVIT

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8

Ex No : 2 Date

: PROGRAM FOR 8 BIT SUBTRACTION USING 8085

AIM: To write an assembly language program for subtraction of two 8 bit data using 8085 microprocessor.

APPARATUS REQUIRED:

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Sl.No 1 2

w.E 3

ALGORITHM:

Name of the Apparatus 8085 Microprocessor kit +5Volts Power Supply

Qty 1 1

Keyboard Connector

1

asy

1. Clear the register “C”

En


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3. Get the first Data from memory Location and move to register “A”. 4. Get the second data from memory location. 5. Subtract the first and second data.

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6. If occur carry the increment the register ‘c’ by one. 7. Store the result to memory location.

VVIT

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FLOW CHART: (8 bit Subtraction)

START


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ge

asy


ge

ge

En

gin

Subtract the first and Second data’s

If carry=1?

YES

NO

Increment “C” register by One

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Store the Result to Memory Location STOP

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VVIT

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10

PROGRAM:

ADDRESS LABEL 8000

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w.E Loop1

MNEMONICS


LXI H,9200


MOV A,M INX H

Move the First Data to A Register Increment the memory pointer

SUB M

Subtract First and Second Data

JNC LOOP1

Jump if No Carry to loop1

INR C

Increment the “C” register by one Complement the Accumulator

CMA

asy

En

STA 9500

HLT


Add by one for two’s complement Store the Result

ADI 01

STA 9501

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COMMENTS

MVI C,00

MOV A,C

VVIT

OPCODE

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Move the Carry result to Register “A” Store the Carry Result

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Stop the program

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Input: Memory location 9200 9201

Data

Output:

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Memory location 9500 9501

Data

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En

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RESULT : Thus the subtraction of two numbers was performed using the 8085 microprocessor.

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12

Exp No : 3 Date : PROGRAM FOR 8 BIT MULTIPLICATION USING 8085 AIM: To write an assembly language program for multiplication of two 8 bit data using 8085 microprocessor.



Qty

1


1

2


1

3

Keyboard Connector

1

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ALGORITHM:

1. Clear the register “A”

asy

En


3. Get the first Data from memory Location and move to register “C”. 4. Get the second data from memory location. 5. Add the Memory Data and A Register. 6. Decrement the register ‘c’ by one

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7. Check the register “C’ is Zero otherwise repeat step 5. 8. Store the result to memory location.

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PROGRAM :

ADDRESS

LABEL

8000

Loop1

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MNEMONICS

MVI LXI MOV INX ADD DCR JNZ STA HLT

A,00 H,9200 C,M H M C LOOP1 9500

OPCODE

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COMMENTS

Clear the “A” Register Initialize the memory pointer Move the First Data to C Reg Increment the memory pointer Add First and Second Data Decrement C register by one Jump if No Zero to loop1 Store the Result Stop the program



13

FLOW CHART: (8 bit Multiplication) START



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AddgeRegister “A” and memory Register then decrement register “c” by 1

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If C=0?

Yes

En

NO

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ge

VVIT

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STOP

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14

Input: Memory location 9200

Data

9201

Output: Memory location

Data

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9500

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En

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RESULT: Thus the multiplication of two numbers was performed using the 8085 microprocessor.

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15

Exp No : 4 Date : PROGRAM FOR 8 BIT DIVISION USING 8085 AIM: To write an assembly language program for division of two 8 bit data using 8085 microprocessor.



Qty

1


1

2


1

3

Keyboard Connector

1

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ALGORITHM:

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1. Clear the Register “C”.

2. Initialize the Memory Pointer.

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3. Get the First Data from memory to Accumulator ( Dividend)

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4. Get the Second Data from memory (Divisor) 5. Compare Register “A” and “M”

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6. If No carry, Subtract Divisor from Dividend [(A)-(M)] 7. Increment Register “C” by one. 8. Compare Register “A” and “M” 9. If No Carry go to step 6 10. Store the result to memory location.

VVIT

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FLOWCHART: (8 bit Division) Start Get the First Data from memory to register ”A”

Get the Second Data from memory

Compare register A and M register

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Clear the register “C”

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If Cy=1?

asy

Yes

No

Subtract register M from register A

En

gin

Compare register A and M register

No

If Cy=1? Yes

Store the result to Memory Location

STOP

VVIT

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17

PROGRAM:

ADDRESS

LABEL

8000

MNEMONICS

OPCODE

MVI C,00


LXI H,9200


MOV A,M


INX H

JC Loop1

Compare register A and M data’s If carry jump to loop1

SUB M

Subtract register A and M Data

INR C

Increment C register by one

CMP M

JNC Loop2

Compare register A and M data’s Jump if No Carry to loop2

STA 9500

Store the Quotient Result

CMP M

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Loop2

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asy

En

MOV A,C

STA 9501 HLT Loop1

MVI A,00 STA 9500

VVIT

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COMMENTS

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Move register C to A Store the Remainder Result

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Stop the program

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Clear the accumulator Store the result

STA 9501

Store the result

HLT

stop

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18

Input:

Memory location

Data

9200 9201

Output:

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Memory location

Data

w.E 9500 9501

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En

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RESULT : Thus the division of two numbers was performed using the 8085 microprocessor.

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19

Exp No : 5 Date : LARGEST NUMBER OF PROGRAM IN A GIVEN ARRAY AIM: To write an assembly language program to find the largest number in a given array using 8085 microprocessor.


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Qty


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ALGORITHM:


1

Keyboard Connector

1

asy

En


gin

2. Load the number of array to B register. 3. Move the first data to register A. 4. Increment the Memory pointer. 5. Compare the register A and M .

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6. If No carry jump to loop2. 7. Move the register M to A. 8. Decrement the register B by one.

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9. Check register B is Zero otherwise go to step 4. 10. Store the Largest value to memory location. 11. Stop.

VVIT

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20

FLOWCHART: (LARGEST NUMBER) START Initialize the Memory location Load the counter to register B Move the first data to register A

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Increment the memory location Compare the register A and M

asy

En

If cy=0?

No

No

Yes

gin

Move the memory data to register A

Check Reg B=0?

Yes

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ing

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Move the result to memory location

STOP

VVIT

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21

PROGRAM:

ADDRES S

LABEL

8000

ww

w.E Loop1

MNEMONICS

OPCOD E

LXI H,9100


MVI B,04

Load the counter to register B

MOV A,M INX H


CMP M

Compare register A and M datas

asy

If No carry jump to loop2

JNC Loop2

En

Move register M to A

MOV A, M

LOOP2

DCR B CMP M

JNZ Loop1 STA 9500 HLT

VVIT

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COMMENTS

gin

Decrement B register by one Compare register A and M data’s Jump if No Zero to loop1

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ing

Store the Result to memory Stop

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22


Data

9100 9101 9102 9103

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Output:

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Memory location 9500

En Data

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RESULT: was

VVIT

Thus the program to find the largest number in a given array using 8085 microprocessor executed.

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23

Exp No : 6 Date : SMALLEST NUMBER OF PROGRAM IN A GIVEN ARRAY AIM: To write an assembly language program to find the smallest number in a given array using 8085 microprocessor.



Qty

1


1

2


1

Keyboard Connector

1

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w.E

3

ALGORITHM:

asy

En


gin


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6. If carry jump to loop2. 7. Move the register M to A. 8. Decrement the register B by one.

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VVIT

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24

FLOWCHART: (Smallest Number) START Initialize the Memory location Load the counter to register B Move the first data to register A Increment the memory location

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Compare the register A and M

w.E

asy

Yes

If cy=0?

En No

gin

Move the memory data to register A

Check B=0? No Yes

Move the result to memory location

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STOP

VVIT

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25

PROGRAM: ADDRESS

LABEL

8000

MNEMONICS

OPCODE

Initialize the memory pointer Load the counter to register B Move the First Data to A Register Increment the memory pointer Compare register A and M datas If carry jump to loop2 Move register M to A Decrement B register by one Compare register A and M data’s Jump if No Zero to loop1 Store the Result to memory Stop

LXI H,9100 MVI B,04 MOV A,M Loop1

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INX H CMP M JC Loop2 MOV A, M DCR B CMP M

Loop2

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Input: Memory location 9100 9101 9102 9103

JNZ Loop1 STA 9500 HLT

asy Data

En

COMMENTS

Output:

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Memory location

9500

Data

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RESULT: Thus the program to find the smallest number in a given array using 8085 microprocessor was executed.

VVIT

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26

Exp No : 7 Date : PROGRAM SORT ASCENDING OREDR IN A GIVEN ARRAY AIM: To write an assembly language program to sort ascending order in a given array using 8085 microprocessor.



Qty

1


1

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w.E


1

Keyboard Connector

1

ALGORITHM:

asy

En


gin


eer

6. If carry jump to loop2. 7. Move the register M to A. 8. Decrement the register B by one.

ing

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VVIT

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27

FOWCHART: (Ascending Order) START Initialize counter1=09 Initialize memory pointer, Initialize counter2= 09 Get the number


ww

w.E

No

Is (pointer-1)>(pointer)?

asy

Yes

Interchange the content

En

gin

Decrement counter2 and Increment memory pointer No

No

Is counter2=0?

Yes

Decrement counter 1

Is counter1=0?

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Yes

STOP

VVIT

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28

PROGRAM: ADDRESS

LABEL

8000

MVI LXI MVI MOV

L3 L2

OPCODE

B,09 H,9100 C,09 A,M

INX H CMP M

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w.E L1

VVIT

MNEMONICS

-


JC L1 MOV D, M MOV M,A DCX H MOV M,D INX H DCR C JNZ L2 DCR B JNZ L3 HLT

asy

En

gin

COMMENTS Load the counter to register B Initialize the memory pointer Load the counter value Move the First Data to A Register Increment the memory pointer Compare register A and M data’s If carry jump to loop1 Move register M to D Move register M to A Decrement memory pointer Move register M to D Increment memory pointer Decrement B register by one Jump if No Zero to loop2 Decrement B register by one Jump if No Zero to loop3 Stop

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29

Input: Memory location 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109

Data

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Output:

Memory location 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109

asy

En

Data

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RESULT: Thus the program of sort the ascending order in given array was executed by using 8085. VVIT

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30

Exp No : 8 Date : PROGRAM SORT DESCENDING OREDR IN A GIVEN ARRAY AIM: To write an assembly language program to sort descending order in a given array using 8085 microprocessor.



Qty

1


1

ww 2 3

w.E


1

Keyboard Connector

1

ALGORITHM:

asy

En


gin


eer

6. If no carry jump to loop2. 7. Move the register M to A. 8. Decrement the register B by one.

ing

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VVIT

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31

FLOWCHART: (Descending order) START

Initialize counter1=09 Initialize memory pointer, Initialize counter2= 09 Get the number

ww

w.E

No


asy

Yes

Is (pointer-1)>(pointer)?

En

gin

Interchange the content No

eer

Decrement counter2 and Increment memory pointer Yes Is counter2=0?

Decrement counter 1

ing

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Yes

Is counter1=0?

STOP

VVIT

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32

PROGRAM:

ADDRESS

LABEL

8000

MNEMONICS

L3 L2

OPCODE

MVI B,04

Load the counter to register B

LXI H,9100


MVI C,04

Load the counter value

MOV A,M


INX H

JNC L1

Compare register A and M datas If carry jump to loop1

MOV D, M

Move register M to D

MOV M,A

Move register M to A

DCX H

Decrement memory pointer

MOV M,D

Move register M to D

INX H

Increment memory pointer

CMP M

ww

w.E

asy

L1

DCR C JNZ L2 DCR B JNZ L3 HLT

VVIT

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COMMENTS

En

gin

Decrement B register by one Jump if No Zero to loop2

eer

Decrement B register by one

ing

Jump if No Zero to loop3 Stop

.ne t



33

Input: Memory location 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109

Data

ww

w.E

Output:

asy

Memory location 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109

En

Data

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ing

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RESULT: Thus the program of sort the descending order in given array was executed by using 8085.

VVIT

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34

EX.NO:9 Date : PROGRAM FOR CODE CONVERSION – DECIMAL TO HEX AIM: To write an assembly language program to convert a given decimal number into hexadecimal number using 8085 microprocessor.

APPARATUS REQUIRED:

ww Sl.No


Qty

1


1

w.E

2 3


1

Keyboard Connector

1

ALGORITHM:

asy

En

1. Initialize the Memory Pointer. 2. Increment B register.

gin

eer

3. Increment accumulator by one and adjust to decimal every time.

ing

4. Compare the given decimal number with accumulator value.

5. When both matches, the equivalent hexadecimal value is in B register. 6. Store the resultant in memory location.

VVIT

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35

FLOWCHART : (DECIMAL TO HEX) START Initialize Memory Pointer

Clear the Accumulator and B register Increment the B register and add register A by one

ww

Decimal adjust accumulator

w.E No

Is A=M?

asy

Yes

En

Store the result to memory Yes

gin

STOP

VVIT

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36

PROGRAM:

ADDRESS

LABEL

8000

Loop1

ww

w.E

MNEMONICS LXI MVI MVI INR ADI DAA CMP JNZ MOV STA HLT

M Loop1 A,B 9500

Memory location

En Data

9100


Data

COMMENTS Initialize the memory pointer Clear the Accumulator Clear the B register Increment the B register Increment the A register Decimal Adjust Accumulator Compare A and M register Jump if No Zero to loop1 Move register B to A Store the result to memory Stop the program

H,9100 A,00 B,00 B 01

asy

Input:

OPCODE

gin

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ing

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RESULT: Thus the program of conversion of decimal to hex given data was executed by using 8085.

VVIT

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37

Exp No:10 Date : PROGRAM FOR CODE CONVERSION – HEXA DECIMAL TO DECIMAL AIM: To write an assembly language program to convert a given hexadecimal number into decimal number using 8085 microprocessor.


ww


1 2 3

Qty


1

w.E


1

Keyboard Connector

1

ALGORITHM:

asy

En

1. Initialize the Memory Pointer. 2. Increment B register.

gin

eer

3. Increment accumulator by one and adjust to decimal every time.

ing

4. Compare the given decimal number with B register value.

5. When both match, the equivalent decimal value is in A register. 6. Store the resultant in memory location.

VVIT

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38

FLOWCHART : (Decimal To Hex) START Initialize Memory Pointer

Clear the Accumulator, Band C register Increment B register and add register A by one

ww

Decimal adjust accumulator

w.E

Is Cy=1?

asy No

Yes

En

Increment the register C by one

gin

Transfer A to D and B to A

Is A=M?

eer

No Yes

Store the Result

ing

.ne t

STOP

VVIT

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39

PROGRAM: ADDRESS

LABEL

8000

MNEMONICS

Loop1

ww

NEXT

w.E

LXI MVI MVI MVI INR ADI DAA JNC INR MOV MOV CMP MOV JNZ STA MOV STA HLT

NEXT C D,A A,B M A,D Loop1 9500 A,C 9501

En

Input: Data


Data

COMMENTS Initialize the memory pointer Clear the Accumulator Clear the B register Clear the C register Increment the B register Increment the A register Decimal Adjust Accumulator If no carry go to next loop Increment register C by one Transfer A to D Transfer B to A Compare A and M register Transfer D to A Jump if No Zero to loop1 Store the result to memory Move register B to A Store the result to memory Stop the program

H,9100 A,00 B,00 C,00 B 01

asy


OPCODE

gin

eer

ing

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RESULT: Thus the program of conversion of hexadecimal to decimal given data was executed by using 8085.

VVIT

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40

EX.NO:11 DATE : PROGRAM FOR CODE CONVERSION – BINARY TO ASCII AIM: To write an assembly language program to convert a given binary number into ASCII number using 8085 microprocessor.

APPARATUS REQUIRED:

ww Sl.No


Qty

1


1

w.E

2 3


1

Keyboard Connector

1

ALGORITHM:

asy

1. Start the program

En

gin

2. Load the data from address 9100 to A

3. Compare register A and data 0Ah(decimal 10). 4. If no carry add 37h with register A. 5. If Carry add 30h with register A. 6. Store the result to memory location.

VVIT

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41

FLOWCHART : ( Binary to ASCII) START Get the data to Accumulator

Compare register A and Data 0Ah

ww

No

w.E

Is Cy=1?

asy

Add register A with 07

En

Yes

gin

Add register A with 30

Store the result

STOP

VVIT

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ing

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42

PROGRAM:

ADDRESS

LABEL

8000

MNEMONICS

ww

w.E

asy

Memory location

En Data

9100

Output:


COMMENTS Get the data to Accumulator Clear the Accumulator Compare register A and data 10 If carry jump to loop1 Add A with 07 Add A with 30 Store the result to memory Stop the program

LDA 9100 MVI A,00 CPI 0A JC LOOP1 ADI 07H ADI 30H STA 9500 HLT

LOOP1

Input:

OPCODE

Data

gin

eer

ing

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RESULT: Thus the program of conversion of binary to ASCII given data was executed by using 8085.

VVIT

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43

Exp No : 12 DATE : PROGRAM FOR CODE CONVERSION – ASCII TO BINARY AIM: To write an assembly language program to convert a given ASCII number into binary number using 8085 microprocessor.



Qty

1


1

ww 2 3

w.E


1

Keyboard Connector

1

ALGORITHM:

asy

1. Start the program

En

2. Load the data from address 9100 to A 3. Compare register A and data 3Ah.

4. If no carry subtract 37h with register A. 5. If carry subtract 30h with register A. 6. Store the result to memory location.

VVIT

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gin

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ing

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44

FLOWCHART : (ASCII TO BINARY) START Get the data to Accumulator

ww

Compare register A and Data 3AH

w.E Yes

asy

Is Cy=1? Yes

Subtract register A with 07

En

No

gin

Subtract register A with 30

Store the result

STOP

VVIT

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ing

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45

PROGRAM:

ADDRESS

LABEL

8000

ww

LOOP1

w.E

MNEMONICS

Get the data to Accumulator

MVI A,00

Clear the Accumulator

CPI 3A JC LOOP1

Compare register A and data 3Ah If carry jump to loop1

ADI 07H

Add A with 07

ADI 30H

Add A with 30

STA 9500

Store the result to memory

HLT

Stop the program

Memory location

En Data

9100


COMMENTS

LDA 9100

asy

Input :

OPCODE

Data

gin

eer

ing

.ne t

RESULT: Thus the program of conversion of ASCII to binary given data was executed by using 8085.

VVIT

-




46

EX.NO:13 DATE : PROGRAM FOR INTERFACING OF ADC WITH 8085 AIM: To write an assembly language program to convert an analog signal into a digital signal using an ADC interfacing with 8085 microprocessor.

APPARATUS REQUIRED: Sl. No 1

Name of the Apparatus 8085 Microprocessor kit

2


1

Keyboard Connector

1

ADC Interfacing kit

1

Multimeter

1

ww 3 4 5

w.E

asy

Working procedure for ADC:

En

Qty 1

gin

 Connect the 5v power supply to trainer kit and adc chord.

eer

 Connect the 26-pin connector from the kit to adc chord.

ing

 Connect the card from keyboard into the socket provided in the kit.  Switch on the power supply.  Assemble your program.  Vary the pot in the adc chord.

.ne t

 Execute it and view the output count in the register A which will be displayed in LCD display.  Repeat the above steps for different inputs in the pots.

VVIT

-




47

8085 ADDRESS: 8255 control register address – 23H 8255 port A address

-20H

8255 port B address

-21 H

8255 port C address

-22H

ww

w.E

asy

En

VVIT

-


gin

eer

ing

.ne t



48

PROGRAM: ADDRESS

LABEL

9000

OPCODE

w.E delay Loop1 Loop2

Analog Input

OUT 23 MVI A,01 OUT 21 MVI A,FF OUT 22 MVI A,00 OUT 22 MVI A,FF OUT 22 CALL 9100 IN20 RST 1 MVI B,0F MVI A,FF NOP NOP DCR A JNZ loop2 DCR B JNZ loop1 RET

asy

En

COMMENTS Control Word for port A as input and port c as output Out in control RE Select input for MUX

MVI A,90

ww 9100

MNEMONICS

Port C is enable Start of Conversion(SOC)

gin

Digital output

Delay subroutine End of conversion(EOC) Break point Delay Count Load data FF to register A No operation No operation Decrement register A If no zero jump to loop2 Decrement register B by one If no zero jump to loop1 Return to main Program

eer

ing

.ne t

RESULT : Thus the conversion of a analog signal into and digital signal was executed using interfacing of ADC with 8085.

VVIT

-




49

EX.NO:14 DATE : PROGRAM FOR INTERFACING OF DAC WITH 8085 AIM: To write an assembly language program to convert a digital signal into a analog signal using an DAC interfacing with 8085 microprocessor.



Qty

1


1

2


1

3

Keyboard Connector

w.E

1

DAC Interfacing kit

1

ww 4 5

asy

CRO

Working procedure for DAC:

1

En

gin

 Connect the 5v power supply to trainer kit and dac(0800) chord.  Connect the 26-pin connector from the kit to dac(0800) chord.

eer

 Connect the card from keyboard into the socket provided in the kit.  Switch on the power supply.

ing

 Assemble your program.Give the digital data in the software program itself.

.ne t

 Execute it and view the output count in the register A which will be displayed in CRO  Repeat the above steps for different digital inputs.

i)SQUARE WAVE FORM ALGORITHM: 1. Load the initial value (00) to Accumulator and move it to DAC. 2. Call the delay program 3. Load the final value (FF) to accumulator and move it to DAC. 4. Call the delay program. 5. Repeat steps 2 to 5.

6. Execute the program and using a CRO, verify that the waveform at the DAC2 output is a square-wave. Modify the frequency of the square-wave, by varying the time delay.

VVIT

-




50


-20H

8255 port B address

-21 H

8255 port C address

-22H

ww

w.E

asy

En

VVIT

-


gin

eer

ing

.ne t



51

PROGRAM: SQUARE WAVE FORM ADDRESS

LABEL

9000 LOOP1

ww 9100

VVIT

w.E delay Loop1 Loop2

-


MNEMONICS MVI A,80 OUT 23 MVI A,FF OUT 21 CALL 9100 MVI A,00 OUT 21 CALL 9100 JMP LOOP1(9004) MVI C,FF MVI B,FF NOP NOP DCR B JNZ loop2 DCR C JNZ loop1 RET

asy

En

OPCODE

COMMENTS Control Word Out in control REG High Input output in port B Delay subroutine Low Input output in port B Delay subroutine Jump To Start

gin

Delay Count Load data FF to register A No operation No operation Decrement register B If no zero jump to loop2 Decrement register C by one If no zero jump to loop1 Return to main Program

eer

ing

.ne t



52

SQUARE WAVE FORMS ;

V

ww

time

w.E

asy

En

VVIT

-


gin

eer

ing

.ne t



53

II) SAW TOOTH GENERATION: ALGORITHM: 1. Load the initial value (00) to Accumulator 2. Move the accumulator content to DAC. 3. Increment the accumulator content by 1. 4. Repeat steps 3 and 4.

ww

5. Output digital data from 00 to FF constant steps of 01 to DAC1 repeat this sequence again and again. As a result a saw – tooth wave will be generated at DAC1 output.

w.E

asy

PROGRAM: SAW TOOTH WAVE FORM

ADDRESS

LABEL

9000

En

MNEMONICS MVI A,80 OUT 23

VVIT

gin

OPCODE

COMMENTS

eer

Control Word

ing

Out in control REG

MVI A,00

LOOP1

OUT 21

output in port B

INR A

Increment register A by one

JNZ LOOP1

If zero jump to loop1

JMP START

Jump To Start

-


Low Input

.ne t

START



54

ww

w.E

SAW TOOTH WAVE FORM :

asy

V

En

VVIT

-


gin

time

eer

ing

.ne t



55

(iii) TRIANGULAR WAVE GENERATION: ALGORITHMS: 1. Load the initial value (00) to Accumulator. 2. Move the accumulator content to DAC 3. Increment the accumulator content by 1. 4. If accumulator content is zero proceed to next step. Else go to step 3. 5. Load value (FF) to accumulator. 6. Move the accumulator content to DAC.

ww

7. Decrement the accumulator content by 1. 8. If accumulator content is zero go to step 2. Else go to step 2.

w.E

PROGRAM: TRIANGULAR WAVE FORM

ADDRESS 9000

asy

LABEL

START LOOP1

LOOP2

MNEMONICS

En

MVI L,00 MOV A,L OUT 21 INR L JNZ LOOP1 MVI L,FF MOVA,L OUT 21 DCR L JNZ LOOP2 JMP START

OPCODE

gin

COMMENTS Transfer 00 to register L Transfer L to A Output in control register Increment register L If no zero jump to loop1 Transfer FF to register L Transfer L to A Output in control register Decrement register L If no zero jump to loop2 Jump to start loop

eer

ing

.ne t

TRIANGULAR WAVE FORM : V

time

RESULT : Thus the conversion of a digital signal into an analog signal was executed using interfacing of DAC with 8085. VVIT

-




56

EXP.No :15 DATE : PROGRAM FOR KEYBOARD AND DISPLAY INTERFACING WITH 8085 AIM: To interface 8279 Programmable Keyboard Display Controller with 8085 Microprocessor.

APPARATUS REQUIRED:

ww Sl.No 1 2 3 4


w.E


1


1

Keyboard Connector

1

asy

En

Keyboard and Display Interfacing kit

PROGRAM: 7 SEGMENT DISPLAY ADDRESS

LABEL

9000 9002 9004 9006 9008 900A 900C 900E 9010 9012 9014 9015 9018 9019 901B VVIT

Qty

-


MNEMONICS MVI MVI OUT MVI OUT MVI OUT MVI MVI OUT DCR JNZ MOV OUT JMP

C,BA A,12 71 A,3E 71 A,A0 71 B,08 A,00 70 B 9012 A,C 70 9019

1

gin

eer

OPCODE

ing

COMMENTS

.ne t

7 segment code for 2 control word Control port Frequency division Control register Display / write inhibit Control register Clear display

Take the character to display



57

a f

g

b

e

c d

Char

D

C

B

A

E

F

G

H

HEX CODE

0

1

1

1

1

1

1

0

0

FC

1

0

1

1

0

0

0

0

0

60

ww

w.E

asy

En

gin

eer

ing

.ne t

RESULT: Thus 8279 controller was interfaced with 8085 and program for rolling display was executed successfully.

VVIT

-




58

EXP.No: 16 DATE : PROGRAM FOR INTERFACING - TRAFFIC LIGHT CONTROLLER WITH 8085 AIM: To write an assembly language program to simulate the traffic light at an intersection using a traffic light interface with 8085 microprocessor.

ww

APPARATUS REQUIRED: Sl.No 1 2 3 4

w.E

Name of the Apparatus 8085 Microprocessor kit

Qty 1


asy

1

Keyboard Connector

1

En

Traffic Light control Interfacing kit

WORKING PROCEDURE:  Connect the 5V supply to trainer kit.

 Connect the 26 pin FRC from the kit.  Switch on the power supply.  Assemble the program.  Execute it and output display by LED.

8085 ADDRESS: PORT CWR PORT A PORT B PORT C

VVIT

-


gin

1

eer

ing

.ne t

ADDRESS 23 20 21 22



59

PROGRAM: TRAFFIC LIGHT CONTROLLER ADDRESS 8500 8502 8504 8506 8508 850A 850C

ww 850F

8512 8514 8516 8519 851C 851E 8520 8522 8524 8527 8529 852B 852E 8530 8532 8534 8536 8539 853B 853D 853F 8541 8543 VVIT

LABEL

MNEMONICS

OPCODE

COMMENTS

MVI A,80 All port as output Out 23 For starting right turn in N-S sides & pedestrian stopping MVI A,0F For pedestrian Out 21 Signal MVI A,4D For green LEDs in N-S OUT 20 Direction CALL Sequence Delay DELAY(8569) CALL Amber delay AMBER(855F) For stopping vehicles in N-S direction & starting E-W direction MVI A,8B For stopping N-S sides OUT 20 For starting E-W sides CALL DELAY Sequence Delay CALL AMBER Amber delay For starting right turn in N-S sides & stopping E-W sides MVI A,49 For free left in all sides OUT 20 For stopping E-W sides MVI A,01 For right turn in N-S sides OUT 22 CALL DELAY MVI A,07 OUT 22 CALL AMBER Stopping Right Turn In N-S Sides & Starting Turn In E-W Sides MVI A,89 OUT 20 MVI A,02 OUT 22 CALL DELAY MVI A,00 OUT 22 MVI A,30 OUT 20 MVI C,04 CALL DELAY For starting Pedestrian

w.E

-


asy

En

gin

eer

ing

.ne t



8546 8548 854A 854C 854E 8550 8553 8555 8257 8259

MVI A,C0 OUT 20 MVI A,F0 OUT 21 MVI C,10 CALL DELAYSUB MVI A,30 OUT 20 MVI C,08 CALL DELAYSUB

825C

JMP CONTINUE

ww 855F 8561

AMBER

MVI A,39

8568 8569

DELAY

OUT 20

w.E

8563 8568

MVI C,08 CALL DELAYSUB

asy RET

En

MVI C,40

856B

gin

CALL DELAYSUB

856E 856F

RET DELAYSUB BACK2

MVI D,FF

BACK1

MVI A,FF

BACK

NOP DCR A JNZ BACK

eer

ing

.ne t

DCR D JNZ BACK1 MOV A,C JZ OUT DCR C JNZ BACK2 OUT

VVIT

60

-


RET



61

ww

w.E

asy

En

gin

eer

ing

.ne t

RESULT: Thus an assembly language program to simulate the traffic light at an intersection using a traffic light was written and implemented.

VVIT

-




62

EXP.No : 17 DATE: PROGRAM FOR I/O PORT SERAIL COMMUNICATION WITH 8085 AIM: To write a program to initiate 8251 and to check the transmission and reception of character. APPARATUS REQUIRED: Sl.No 1 2

ww 3 4

Name of the Apparatus 8085 Microprocessor kit +5Volts Power Supply

Qty 1 1

w.E

Keyboard Connector

1

8251/8253 Interfacing kit

1

asy

ALGORITHM:

En

1. Initialize timer (8253) IC

gin

2. Move the Mode command word (36H) to A reg. 3. Output it port address CE

4. Move the command instruction word (37H) to A reg. 5. Output it to port address C8

eer

PROGRAM: SQUARE WAVE GENERATION ADDRESS

LABEL

9000

VVIT

-


MNEMONICS MVI OUT MVI OUT MVI OUT HLT

A,36 CE A,0A C8 A,00 C8

OPCODE

ing

.ne t

COMMENTS

Channel 0 in mode 3 Send mode control word LSB of count Write count to register MSB of count Write count to register Stop the program



63

V

time

ww

w.E

asy

En

gin

eer

ing

.ne t

RESULT: Thus the program to initiate 8251 was written and executed.

VVIT

-




64

Exp No : 18 Date : PROGRAM FOR 8 BIT ADDITION USING 8051 AIM: To write an assembly language program for addition of two 8 bit data using 8051 microcontroller.



Qty

1

8051 Microcontroller kit

1

2


1

3

w.E

1

ww

Keyboard Connector

ALGORITHM:

asy

1. Clear the register “C”

En


gin

3. Get the first Data from memory Location and move to register “A”. 4. Get the second data from memory location. 5. Add first and second data.

6. If carry the increment the register ‘C’ by one. 7. Store the result to memory location.

VVIT

-


eer

ing

.ne t



65

FLOW CHART: (8 bit Addition)

START

Clear the “Cy” Flag and R0 register

ww


w.E

ge

ge

Get the Second data from memory

asy

En

Add the first and Second data’s

ge

If carry=1?

gin

Yes

Increment “R0” register by One

ge

ge

VVIT

-


eer

NO


ing

.ne t

STOP



66

PROGRAM: ADDRESS

LABEL

8000

MNEMONICS

OP CODE

Clear the “Carry” Flag

CLR C MOV R0,#00 MOV DPTR,#9200 MOVX A,@DPTR MOV B,A INC DPTR MOVX A,@DPTR

ww

w.E Loop1

ADD A,B JNC Loop1 INR R0

asy

HLT

COMMENTS

En

MOV DPTR,#9500 MOVX @DPTR,A MOV A,R0 INC DPTR MOVX @DPTR,A SJMP : HLT

gin

Input: Memory location 9200 9201

Data

Memory location

Data

Initialize the memory pointer Move the First Data to A Reg Transfer Data To B Increment the memory pointer Get the second data from memory Add First and Second Data Jump if No Carry to loop1 Increment the “C” register by one Initialize the memory pointer Store The Result Move the Carry result to Reg “A” Increment the memory pointer Store the Carry Result Stop the program

eer

ing

.ne t

Output:

9500 9501

RESULT : Thus the addition of two numbers was performed using the 8085 microprocessor .

VVIT

-




67

Exp No : 19 Date : PROGRAM FOR 8 BIT SUBTRACTION USING 8051 AIM: To write an assembly language program for subtraction of two 8 bit data using 8051 microcontroller.



Qty

1


1

2


1

3

w.E

1

ww

Keyboard Connector

ALGORITHM:

asy


En

2. Get the first Data from memory and move to register A.

gin

3. Get the second data from memory location. 4. Subtract the first and second data.

5. Store the result to memory location.

VVIT

-


eer

ing

.ne t



68

FLOW CHART: (8 bit Subtraction) START


ge

ww

Get the Second data from memory location

w.E

Subtract the first and Second data’s

ge

asy

ge

En


ge

VVIT

-


STOP

gin

eer

ing

.ne t



69

PROGRAM: ADDRESS

LABEL

8000

MNEMONICS

OPCODE

Initialize the memory pointer Move the First Data to A Reg Transfer Data To B Increment the memory pointer Get the second data from memory Add First and Second Data Initialize the memory pointer Store The Result Stop the program

MOV DPTR,#9200 MOVX A,@DPTR MOV B,A INC DPTR MOVX A,@DPTR

ww

SUBB A,B MOV DPTR,#9500

w.E HLT

Input:

MOVX @DPTR,A SJMP : HLT

asy

Memory location 9200 9201

En Data

gin

Output:

Memory location

Data

COMMENTS

eer

ing

.ne t

9500

RESULT : Thus the subtraction of two numbers was performed using the 8085 microprocessor.

VVIT

-




70

Exp No : 20 Date : PROGRAM FOR 8 BIT MULTIPLICATION USING 8051 AIM: To write an assembly language program for multiplication of two 8 bit data using 8051 microcontroller. APPARATUS REQUIRED: Sl.No

ww 1 2 3


Qty


1

w.E


1

Keyboard Connector

1

ALGORITHM:

asy

En


gin

2. Get the first Data from memory and move to register A. 3. Get the second data from memory location. 4. Multiply the first and second data. 5. Store the result to memory location.

VVIT

-


eer

ing

.ne t



71

FLOW CHART: ( 8 bit Multiplication)

START


ww

ge


w.E

ge

En

Initialize the output memory location

ge

ge

gin


ge

VVIT

asy

Multiply first and second data

-


STOP

eer

ing

.ne t



72

PROGRAM:

ADDRESS

LABEL

8000

MNEMONICS

OPCODE

MOV DPTR,#9200


MOVX A,@DPTR

Move the First Data to A Register Transfer Data To B

MOV B,A

MOV DPTR,#9500

Increment the memory pointer Get the second data from memory Multiply First and Second Data Initialize the memory pointer

MOVX @DPTR,A

Store The LSB Result

INC DPTR

Increment the data pointer

INC DPTR

ww

MOVX A,@DPTR

w.E

MUL AB

asy

MOV B,A

En

MOVX @DPTR,A HLT

COMMENTS

SJMP

: HLT

gin


Data

9200 9201

Transfer B to A Store the MSB result

eer

Stop the program

ing

.ne t

Output: Memory location

Data

9500 9501

RESULT: Thus the multiplication of two numbers was performed using the 8085 microprocessor.

VVIT

-




73

Exp No : 21 Date : PROGRAM FOR 8 BIT DIVISION USING 8051 AIM: To write an assembly language program for division of two 8 bit data using 8051 microcontroller.

APPARATUS REQUIRED: Sl.No 1


Qty


1

ww 2


1

3

Keyboard Connector

1

w.E

ALGORITHM:

asy

1. Initialize the memory pointer to data location. 2. Get the first Data from memory and move to register A.

En

3. Get the second data from memory location. 4. Divide the first and second data.

5. Store the result to memory location.

VVIT

-


gin

eer

ing

.ne t



74

FLOW CHART: (8 bit Division)

START


ww

w.E

ge

ge

asy

Divide first and second data

En

Initialize the output memory location

ge

ge

gin


ge

VVIT


-


STOP

eer

ing

.ne t



75

PROGRAM: ADDRESS

LABEL

8000

MNEMONICS

OPCODE

Initialize the memory pointer Move the First Data to A Reg Transfer Data To B Increment the memory pointer Get the second data from memory Multiply First and Second Data Initialize the memory pointer Store The Remainder Result Increment the data pointer Transfer B to A Store the Quotient result Stop the program

MOV DPTR,#9200 MOVX A,@DPTR MOV B,A INC DPTR MOVX A,@DPTR DIV AB

ww

w.E

MOV DPTR,#9500 MOVX @DPTR,A INC DPTR MOV B,A MOVX @DPTR,A SJMP : HLT

asy

HLT

Input:

Memory location

En

9200 9201


gin

Data

Data

COMMENTS

eer

ing

.ne t

9501

Result: Thus the division of two numbers was performed using the 8085 microprocessor.

VVIT

-




76

EX.NO:22 DATE : PROGRAM FOR INTERFACING OF ADC WITH 8051 AIM: To write an assembly language program to convert an analog signal into a digital signal using an ADC interfacing with 8051 microcontroller.

APPARATUS REQUIRED: Sl. No


ww 1 2 3 4 5

Qty

8051 Microcontroller kit +5Volts Power Supply Keyboard Connector ADC Interfacing kit Multi-meter

1 1 1 1 1

w.E

asy

Working procedure for ADC:

En

 Connect the 5v power supply to trainer kit and adc chord.

gin

 Connect the 26-pin connector from the kit to adc chord.

eer

 Connect the card from keyboard into the socket provided in the kit.  Switch on the power supply.  Assemble your program.  Vary the pot in the adc chord.

ing

.ne t

 Execute it and view the output count in the register A which will be displayed in LCD display.  Repeat the above steps for different inputs in the pots.

VVIT

-




77


-6000H

8255 port B address

-6001 H

8255 port C address

-6002H

ww

w.E

asy

En

VVIT

-


gin

eer

ing

.ne t



78

PROGRAM: ADDRESS

LABEL

9000

MNEMONICS

OPCODE

Control Word for port A as input and port c as output

MOV DPRT,#6003

ww

w.E

MOV A,#90 MOVX @DPTR,A MOV DPTR,#6002 MOV A,#FF MOVX @DPTR,A MOV DPRT,#6002 MOV A,#00 MOVX @DPTR,A MOV DPTR,#6002 MOV A,#FF MOVX @DPTR,A LCALL DELAY MOV DPTR,#6000 MOV A,#FF MOVX @DPTR,A LCALL 00BB MOV R1,#FF NOP NOP DJNZ R1,LOOP RET

asy

En

DELAY LOOP

Analog Input

SOC(start of conversion)

gin

Digital output

COMMENTS

eer

ing

.ne t

Return to main Program

RESULT: Thus the conversion of a analog signal into and digital signal was executed using interfacing of ADC with 8051.

VVIT

-




79

EX.NO:23 DATE : PROGRAM FOR INTERFACING OF DAC WITH 8051 AIM: To write an assembly language program to convert an digital signal into a analog signal using an DAC interfacing with 8051 microcontroller.

APPARATUS REQUIRED: Sl.No 1 2 3 4 5

Name of the Apparatus 8051 Microcontroller kit +5Volts Power Supply Keyboard Connector DAC Interfacing kit CRO

ww

w.E

asy

Qty 1 1 1 1 1

Working procedure for DAC:  Connect the 5v power supply to trainer kit and dac(0800) chord.

En



Connect the 26-pin connector from the kit to dac(0800) chord.



Connect the card from keyboard into the socket provided in the kit.



Switch on the power supply.



Assemble your program.



Give the digital data in the software program itself.



Execute it and view the output count in the register A which will be displayed in CRO



Repeat the above steps for different digital inputs.

gin

eer

ing

i)SQUARE WAVE FORM

.ne t

ALGORITHM: 1. Load the initial value (00) to Accumulator and move it to DAC. 2. Call the delay program 3. Load the final value (FF) to accumulator and move it to DAC. 4. Call the delay program. 5. Repeat steps 2 to 5. 6. Execute the program and using a CRO, verify that the waveform at the DAC2 output is a square-wave. Modify the frequency of the square-wave, by varying the time delay. VVIT

-




80


-6000H

8255 port B address

-6001 H

8255 port C address

-6002H

ww

w.E

asy

En

VVIT

-


gin

eer

ing

.ne t



81

PROGRAM: SQUARE WAVE FORM

ADDRESS

LABEL

8000

LOOP1

ww

MNEMONICS

OPCODE

COMMENTS

MOV P1,#00

Low Input

LCALL DELAY

Call Delay

MOV P1,#99

High Input

LCALL DELAY

Call Delay

SJMP START

Jump To Start

DELAY

MOV R0,#FF

RPT

DJNZ R0,RPT Return to main Program

RET

w.E

asy

En

V

gin time

VVIT

-


eer

ing

.ne t



82

II) SAW TOOTH GENERATION: ALGORITHM: 1. Load the initial value (00) to Accumulator 2. Move the accumulator content to DAC. 3. Increment the accumulator content by 1. 4. Repeat steps 3 and 4. 5. Output digital data from 00 to FF constant steps of 01 to DAC1 repeat this sequence again and again. As a result a saw – tooth wave will be generated at DAC1 output.

ww

PROGRAM: SAW TOOTH WAVE FORM

w.E

ADDRESS LABEL 9000

LOOP

MNEMONICS

asy

COMMENTS

MOV P1,R1

En

LCALL DELAY INC R1 SJMP LOOP

DELAY MOV R0,#FF RPT

OPCODE

DJNZ,R0,RPT

gin

eer

RET

V

ing

.ne t

time

RESULT : Thus the conversion of a digital signal into an analog signal was executed using interfacing of DAC with 8051.

VVIT

-




EX.NO:24 DATE

83

:

PROGRAM FOR INTERFACING STEPPER MOTOR USING 8051 MICROCONTROLLER AIM: To interface a stepper motor with 8051 microcontroller and operate it.

THEORY: A motor in which the rotor is able to assume only discrete stationary angular position is a stepper motor. The rotary motion occurs in a step-wise manner from one equilibrium position to the next. Stepper Motors are used very wisely in position control systems like printers, disk drives, process control machine tools, etc. The basic two-phase stepper motor consists of two pairs of stator poles. Each of the four poles has its own winding. The excitation of any one winding generates a North Pole. A South Pole gets induced at the diametrically opposite side. The rotor magnetic system has two end faces. It is a permanent magnet with one face as South Pole and the other as North Pole. The Stepper Motor windings A1, A2, B1, B2 are cyclically excited with a DC current to run the motor in clockwise direction. By reversing the phase sequence as A1, B2, A2, B1, anticlockwise stepping can be obtained.

ww

w.E

asy

En

gin

eer

2-PHASE SWITCHING SCHEME: In this scheme, any two adjacent stator windings are energized. The switching scheme is shown in the table given below. This scheme produces more torque.

A1

A2

B1

B2

HEX

1 0

0 1

0 0

1 1

09 05

0

1

1

0

06

1

0

1

0

0A

ing

CLOCK WISE

.ne t

ANTI CLOCKWISE

PROCEDURE: 1. Enter the above program starting from location 4100.and execute the same. 2. The stepper motor rotates. 3. Varying the count at R4 and R5 can vary the speed. 4. Entering the data in the look-up TABLE in the reverse order can vary direction of rotation. VVIT

-




84

PROGRAM: ADDRESS 8000

LABEL

MNEMONICS

OPCODE

START

MOV DPTR,#TABLE MOV R0,#04 MOVX A,@DPTR LOOP1 PUSH DPH PUSH DPL MOV DPTR,#0FFCO MOVX @DPTR,A MOV R4,#0FF MOV R5,#0FF D1 DJNZ R5,D2 D2 DJNZ R4,D1 POP DPL POP DPH INC DPTR SJMP : START LOOKUP 09,06,05,0A

Initialize the memory pointer Load the counter Move the First Data to A Reg Transfer DPH to SP Transfer DPL to SP Initialize the port address

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COMMENTS

Send the value to port address Delay subroutine

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Next data Stop the program Data’s

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RESULT: Thus a stepper motor was interfaced with 8051 and run in forward and reverse directions at various speeds.

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85

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