ANURAG COLLEGE OF ENGINEERING · Program for digital clock design using 8086. 6. Interfacing ADC...

ANURAG COLLEGE OF ENGINEERINGDEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING

III B.Tech. ECE- II SEM L T/P/D C0 -/3/- 2(56606)MICROPROCESSORS AND MICROCONTROLLERS LABList of Experiments:

1. Programs for 16 bit arithmetic operations for 8086 (using Various Addressing Modes).

2. Program for sorting an array for 8086.

3. Program for searching for a number or character in a string for 8086.

4. Program for string manipulations for 8086.

5. Program for digital clock design using 8086.

6. Interfacing ADC and DAC to 8086.

7. Parallel communication between two microprocessors using 8255.

8. Serial communication between two microprocessor kits using 8251.

9. Interfacing to 8086 and programming to control stepper motor.

10. Programming using arithmetic, logical and bit manipulation instructions of 8051.

11. Program and verify Timer/Counter in 8051.

12. Program and verify Interrupt handling in 8051.

13. UART Operation in 8051.

14. Communication between 8051 kit and PC.

15. Interfacing LCD to 8051.

16. Interfacing Matrix/Keyboard to 8051.

17. Data Transfer from Peripheral to Memory through DMA controller 8237/8257.

Note: Minimum of 12 experiments to be conducted.

1

EXP NO.1: PROGRAMS FOR 16 BIT ARITHMETIC OPERATIONS FOR8086 (USING VARIOUS ADDRESSING MODES).

A) ADDITION:i) 16 BIT ADDITION (DIRECT ADDERESSING MODE):

AIM: - To write an assembly language program for Addition of two 16-bit numbers.

APPARATUS: 1. 8086 microprocessor kit/MASM ----1 2. RPS (+5V) ----1

PROGRAM:

ASSUME CS: CODE, DS :DATA

DATA SEGMENT

NUM DW 1232H

DATA ENDS

CODE SEGMENT

START:

MOV AX ,DATA

MOV DS, AX

MOV AX,4562H

ADD AX,NUM

INT 03H

CODE ENDS

END START

2

OUTPUT:

MEMORY LOCATION

OP-CODE LABEL INSTRUCTION

1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B86245 MOV AX,45621443:0008 03060000 ADD AX,[0000]1443:000C CC INT 3

AX=5794 BX=0000 CX=001D DX=0000 SP=0000 BP=0000 SI=0000DI=0000 DS=1442 ES=1432 SS=1442 CS=1443 IP=000C NV UP EI PLNZ NA PO NC

3

ii) 16 BIT ADDITION(IMMEDIATE ADDERESSING MODE):



PROGRAM: ASSUME CS:CODE

CODE SEGMENT

START:

MOV BX,5678H

ADD AX,1234H

INT 03H

CODE ENDS

END START

4

OUTPUT:

MEMORY LOCATION


1442:0000 B87856 MOV AX,56781442:0003 053412 ADD AX,12341442:0006 CC INT 3

AX=68AC BX=0000 CX=0007 DX=0000 SP=0000 BP=0000 SI=0000DI=0000 DS=1432 ES=1432 SS=1442 CS=1442 IP=0006 NV UP EI PLNZ NA PE NC

5

iii) 16 BIT ADDITION(INDIRECTADDERESSING MODE):



PROGRAM:

ASSUME CS:CODE,DS:DATA

DATA SEGMENT

NUM DW 02H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,4444H

MOV BX,OFFSET NUM

ADD AX,[BX]

INT 03H

CODE ENDS

END START

6

OUTPUT:

MEMORY LOCATION


1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B84444 MOV AX,44441443:0008 BB0000 MOV AX,44441443:000B 0307 MOV BX,00001443:000D CC ADD AX,[BX]

AX=4446 BX=0000 CX=001E DX=0000 SP=0000 BP=0000 SI=0000DI=0000 DS=1442 ES=1432 SS=1442 CS=1443 IP=000D NV UP EI PLNZ NA PO NC

7

iv) 16 BIT ADDITION (REGISTERADDERESSING MODE):


APPARATUS: 1. 8086 microprocessor kit/MASM ----1 2. RPS (+5V) ----1PROGRAM:

ASSUME CS:CODE

CODE SEGMENT

START:

MOV BX,5678H

MOV AX,1234H

ADD AX,BX

INT 03H

CODE ENDS

END START

8

OUTPUT:

MEMORY LOCATION


1442:0000 BB7856 MOV BX,56781442:0003 B83412 MOV AX,12341442:0006 03C3 ADD AX,BX1442:0008 CC INT 3

AX=68AC BX=5678 CX=0009 DX=0000 SP=0000 BP=0000 SI=0000DI=0000DS=1432 ES=1432 SS=1442 CS=1442 IP=0008 NV UP EI PLNZ NA PE NC

9

B) SUBTRACTION:i) 16 BIT SUBTRACTION (DIRECT ADDRESSING MODE):

AIM: - To write an assembly language program for subtraction of two 16-bit numbers.



DATA SEGMENT

NUM DW 1232H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,4562H

SUB AX,NUM

INT 03H

CODE ENDS

END START

10

OUTPUT:

MEMORY LOCATION


1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B86245 MOV AX,45621443:0008 2B060000 SUB AX,[0000]1443:000C CC INT 3

AX=3330 BX=0000 CX=001D DX=0000 SP=0000 BP=0000 SI=0000DI=0000 DS=1442 ES=1432 SS=1442 CS=1443 IP=000C NV UP EI PLNZ NA PE NC

11

ii) 16 BIT SUBTRACTION (IMMEDIATE ADDRESSING MODE):



PROGRAM:

ASSUME CS:CODE

CODE SEGMENT

START:

MOV AX,5678H

SUB AX,1234H

INT 03H

CODE ENDS

END START

12

OUTPUT:

MEMORY LOCATION


1442:0000 B87856 MOV AX,56781442:0003 2D3412 SUB AX,12341442:0006 CC INT 3

AX=4444 BX=0000 CX=0007 DX=0000 SP=0000 BP=0000 SI=0000DI=0000 DS=1432 ES=1432 SS=1442 CS=1442 IP=0006 NV UP EI PLNZ NA PE NC

13

iii) 16 BIT SUBTRACTION (INDIRECTADDRESSING MODE):



PROGRAM:


DATA SEGMENT

NUM DW 02H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,4444H

MOV BX,OFFSET NUM

SUB AX,[BX]

INT 03H

CODE ENDS

END START

14

OUTPUT:

MEMORY LOCATION


1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B84444 MOV AX,44441443:0008 BB0000 MOV BX,00001443:000B 2B07 SUB AX,[BX]1443:000D CC INT 3

AX=4442 BX=0000 CX=001E DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

DS=1442 ES=1432 SS=1442 CS=1443 IP=000D NV UP EI PL NZ NA PE NC

15

iv) 16 BIT SUBTRACTION (REGISTERADDRESSING MODE):



PROGRAM:

ASSUME CS:CODE

CODE SEGMENT

START:

MOV BX,5678H

MOV AX,1234H

SUB AX,BX

INT 03H

CODE ENDS

END START

16

OUTPUT:

MEMORY LOCATION


1442:0000 BB7856 MOV BX,56781442:0003 B83412 MOV AX,12341442:0006 2BC3 SUB AX,BX1442:0008 CC INT 3

AX=BBBC BX=5678 CX=0009 DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

DS=1432 ES=1432 SS=1442 CS=1442 IP=0008 NV UP EI NG NZ AC PO CY

17

C) MULTIPLICATION:

i) 16 BIT MULTIPLICATION (DIRECT ADDERESSING MODE):

AIM: - To write an assembly language program for multiplication of two 16-bit numbers.

APPARATUS: 1. 8086 microprocessor kit/MASM ----12. RPS (+5V) ----1

PROGRAM:


DATA SEGMENT

X DB 02H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,0002H

MUL X

INT 03H

CODE ENDS

END START

18

OUTPUT:

MEMORY LOCATION


1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B80200 MOV AX,00021443:0008 F6260000 MUL BYTE PTR [0000]1443:000C CC INT 3

AX=0004 BX=0000 CX=001D DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

DS=1442 ES=1432 SS=1442 CS=1443 IP=000C NV UP EI PL NZ NA PO NC

19

C) MULTIPLICATION:

ii) 16 BIT MULTIPLICATION (REGISTER ADDERESSING MODE):



PROGRAM:

ASSUME CS:CODE

CODE SEGMENT

START:

MOV BX,1234H

MOV AX,1234H

MUL BX

INT 03H

CODE ENDS

END START

20

OUTPUT:

MEMORY LOCATION


1442:0000 BB3412 MOV BX,1234H1442:0003 B83412 MOV AX,1234H1442:0006 F7E3 MUL BX1442:0008 CC INT 03H

AX=5A90 BX=1234 CX=0009 DX=014B SP=0000 BP=0000 SI=0000 DI=0000

DS=1432 ES=1432 SS=1442 CS=1442 IP=0008 OV UP EI PL NZ NA PE CY

21

D) DIVISION:

i) 16 BIT DIVISION (DIRECT ADDRESSING MODE):



PROGRAM:


DATA SEGMENT

NUM DW 02H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,4444H

DIV NUM

INT 03H

CODE ENDS

END START

22

OUTPUT:

MEMORY LOCATION


1443:0000 B84214 MOV AX,14421443:0003 8ED8 MOV DS,AX1443:0005 B84444 MOV AX,44441443:0008 F7360000 DIV WORD PTR [0000]1443:000C CC INT 3

AX=2222 BX=0000 CX=001D DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

DS=1442 ES=1432 SS=1442 CS=1443 IP=000C NV UP EI PL NZ NA PO NC

23

D) DIVISION:

ii) 16 BIT DIVISION (REGISTER ADDRESSING MODE):



PROGRAM:

ASSUME CS:CODE

CODE SEGMENT

START:

MOV BX,0022H

MOV AX,4444H

DIV BX

INT 03H

CODE ENDS

END START

24

OUTPUT:

MEMORY LOCATION


1442:0000 BB2200 MOV BX,00221442:0003 B84444 MOV AX,44441442:0006 F7F3 DIV BX1442:0008 CC INT 3

AX=0202 BX=0022 CX=0009 DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

DS=1432 ES=1432 SS=1442 CS=1442 IP=0008 NV UP EI PL NZ NA PO NC

25

EXP NO.2: PROGRAM FOR SORTING AN ARRAY FOR 8086

A) ASCENDING ORDER

AIM:-Program to sort the given numbers in ascending order


PROGRAM:ASSUME CS:CODE,DS:DATA

DATA SEGMENT

LIST DW 55H,67H,23H,45H

COUNT EQU 04H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV DX,COUNT-1

L1:MOV CX,DX

MOV SI,OFFSET LIST

L2:MOV AX,[SI]

CMP AX,[SI+2]

JL L3

XCHG [SI+2],AX

26

XCHG [SI],AX

L3:ADD SI,02

LOOP L2

DEC DX

JNZ L1

INT 03H

CODE ENDS

END START

OUTPUT:

MEMORY LOCATION


145F:0000 B85E14 MOV AX,145E145F:0003 8ED8 MOV DS,AX145F:0005 BA0300 MOV DX,0003145F:0008 8BCA L1 MOV CX,DX145F:000A BE0000 MOV SI,0000145F:000D 8B04 L2 MOV AX,[SI]145F:000F 3B4402 CMP AX,[SI+02]145F:0012 7C05 JL 0019145F:0014 874402 XCHG AX,[SI+02]145F:0017 8704 XCHG AX,[SI]145F:0019 83C602 L3 ADD SI,+02145F:001C E2EF LOOP 000D145F:001E 4A DEC DX145F:001F 75E7 JNZ 0008145F:0021 CC INT 3

AX=0023BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=0002 DI=0000

DS=145E ES=144E SS=145E CS=145F IP=0021 NV UP EI PL ZR NA PE NC

-D 145E:0000

27

145E:0000 23 00 45 00 55 00 67 00-00 00 00 00 00 00 00 00

B) DECENDING ORDER

AIM:-Program to sort the given numbers in decending order


PROGRAM:ASSUME CS:CODE,DS:DATA

DATA SEGMENT

LIST DW 55H,67H,23H,45H

COUNT EQU 04H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV DX,COUNT-1

L1:MOV CX,DX

MOV SI,OFFSET LIST

L2:MOV AX,[SI]

CMP AX,[SI+2]

JA L3

XCHG [SI+2],AX

XCHG [SI],AX

L3:ADD SI,02

28

LOOP L2

DEC DX

JNZ L1

INT 03H

CODE ENDS

END START

OUTPUT:

MEMORY LOCATION


145F:0000 B85E14 MOV AX,145E145F:0003 8ED8 MOV DS,AX145F:0005 BA0300 MOV DX,0003145F:0008 8BCA L1 MOV CX,DX145F:000A BE0000 MOV SI,0000145F:000D 8B04 L2 MOV AX,[SI]145F:000F 3B4402 CMP AX,[SI+02]145F:0012 7705 JA 0019145F:0014 874402 XCHG AX,[SI+02]145F:0017 8704 XCHG AX,[SI]145F:0019 83C602 L3 ADD SI,+02145F:001C E2EF LOOP 000D145F:001E 4A DEC DX145F:001F 75E7 JNZ 0008145F:0021 CC INT 3

AX=0093 BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=0002 DI=0000 DS=145E ES=144E SS=145E CS=145F IP=0021 NV UP EI PL ZR NA PE NC

-D 145E:0000 000A

145E:0000 93 00 67 00 45 00 05 00-00 00 00

29

EXP NO: 3 PROGRAM FOR SEARCHING FOR A NUMBER ORCHARACTER IN A STRING FOR 8086.

A) SERCHING OF AN ARRAY

AIM: Write an alp program for to search a number or character from an array.


SEARCHING AN ARRAY CASE: EQUAL

ASSUME CS: CODE, DS: DATA

DATA SEGMENT

ARRAY DB 27H, 0A9H, 82H, 4DH, 36H

N1 DB 82H

N2 DB 25H

COUNT DB 05H

DATA ENDS

CODE SEGMENT

START:

MOV AX, DATA

MOV DS, AX

MOV CL, COUNT

MOV BX, OFFSET ARRAY

LEA BX, ARRAY

MOV DL, N1

30

BACK: CMP DL,[BX]

JE EXIT

INC BX

LOOP BACK

MOV AX, 0FFFFH

INT 03H

EXIT: MOV AX, 00H

INT 03H

CODE ENDS

END START

SEARCHING AN ARRAY CASE: NOT EQUAL

ASSUME CS: CODE, DS: DATA

DATA SEGMENT

ARRAY DB 27H, 0A9H, 82H, 4DH, 36H

N1 DB 82H

N2 DB 25H

COUNT DB 05H

DATA ENDS

CODE SEGMENT

START:

MOV AX, DATA

MOV DS, AX

MOV CL, COUNT

31

MOV BX, OFFSET ARRAY

LEA BX, ARRAY

MOV DL, N2

BACK: CMP DL, [BX]

JE EXIT

INC BX

LOOP BACK

MOV AX, 0FFFFH

INT 03H

EXIT: MOV AX, 00H

INT 03H

CODE ENDS

END START

32

OUTPUT:(CASE:EQUAL)

MEMORY LOCATION


145F:0000 B85E14 MOV AX,145E145F:0003 8ED8 MOV DS,AX145F:0005 8A0E0700 MOV CL,[0007]145F:0009 BB0000 MOV BX,0000145F:000C 8D1E0000 LEA BX,[0000]145F:0010 8A160500 MOV DL,[0005]145F:0014 3A17 BACK CMP DL,[BX]145F:0016 7407 JZ 001F145F:0018 43 INC BX145F:0019 E2F9 LOOP 0014145F:001B B8FFFF MOV AX,FFFF145F:001E CC INT 3145F:001F B80000 EXIT MOV AX,0000145F:0022 CC INT 3

AX=0000 BX=0002 CX=0003 DX=0082 SP=0000 BP=0000 SI=0000DI=0000 DS=145E ES=144E SS=145E CS=145F IP=0022 NV UP EIPL ZR NA PE NC

-D 145E:0000 0004

145E:0000 27 A9 82 4D 36

33

OUTPUT(CASE:NOT EQUAL)

MEMORY LOCATION


145F:0000 B85E14 MOV AX,145E145F:0003 8ED8 MOV DS,AX145F:0005 8A0E0700 MOV CL,[0007]145F:0009 BB0000 MOV BX,0000145F:000C 8D1E0000 LEA BX,[0000]145F:0010 8A160600 MOV DL,[0006]145F:0014 3A17 BACK CMP DL,[BX]145F:0016 7407 JZ 001F145F:0018 43 INC BX145F:0019 E2F9 LOOP 0014145F:001B B8FFFF MOV AX,FFFF145F:001E CC INT 3145F:001F B80000 EXIT MOV AX,0000145F:0022 CC INT 3

AX=FFFF BX=0005 CX=0000 DX=0025 SP=0000 BP=0000 SI=0000 DI=0000 DS=145E ES=144E SS=145E CS=145F IP=001E NV UP EI PL NZ NA PE CY

-D 145E:0000 0004

145E:0000 27 A9 82 4D 36

34

B)SERCHING A CHARACTER

AIM: Write an alp program for to search a number or character from a string.


ASSUME CS:CODE,ES:DATA

DATA SEGMENT

STG DB "ANURAG COLLEGE OF ENGINEERING"

CHAR1 DB "C"

CHAR2 DB "Z"

M1 DB "CHARACTER FOUND $"

M2 DB "CHARACTER NOT FOUND$"

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV ES,AX

STD

LEA DI,[STG+0AH]

MOV AL,CHAR1

35

MOV CX,28

REPNZ SCASB

JZ FOUND

LEA DX,M2

JMP XYZ

FOUND:LEA DX,M1

XYZ:MOV AH,09H

INT 21H

MOV AH,4CH

INT 21H

CODE ENDS

END START

36

OUTPUT:

MEMORY LOCATION


1463:0000 B85E14 MOV AX,145E1463:0003 8EC0 MOV ES,AX1463:0005 FD STD1463:0006 8D3E0A00 LEA DI,[000A]1463:000A 26 ES:1463:000B A01D00 MOV AL,[001D]1463:000E B91C00 MOV CX,001C1463:0011 F2 REPNZ1463:0012 AE SCASB1463:0013 7406 JZ 001B1463:0015 8D163000 LEA DX,[0030]1463:0019 EB04 JMP 001F1463:001B 8D161F00 LEA DX,[001F]1463:001F B409 MOV AH,091463:0021 CD21 INT 211463:0023 B44C MOV AH,4C1463:0025 CD21 INT 21

ANURAG COLLEGE OF ENGINEERINGCZ

CHARACTER FOUND

Program terminated normally

37

EXP NO.4: PROGRAM FOR STRING MANIPULATIONS FOR 8086.

A) MOVING BLOCK OF DATA FROM ONE MEMORY LOCATION TO ANOTHER MEMORY LOCATION

AIM: To write an alp for transfer block of data from one memory location to anothermemory location.


PROGRAM:

ASSUME CS:CODE,DS:DATA,ES:EXTRA

DATA SEGMENT

STG1 DB "ELECTRONICS"

DATA ENDS

EXTRA SEGMENT

STG2 DB 11 DUP(?)

EXTRA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AX,EXTRA

MOV ES,AX

CLD

38

LEA SI,STG1

LEA DI,STG2

MOV CX,11

REP MOVSB

INT 03H

CODE ENDS

END START

39

OUTPUT:

MEMORY LOCATION


1460:0000 B85E14 MOV AX,145E1460:0003 8ED8 MOV DS,AX1460:0005 B85F14 MOV AX,145F1460:0008 8EC0 MOV ES,AX1460:000A FC CLD1460:000B 8D360000 LEA SI,[0000]1460:000F 8D3E0000 LEA DI,[0000]1460:0013 B90B00 MOV CX,000B1460:0016 F3 REPZ1460:0017 A4 MOVSB1460:0018 CC CC INT 3

-D 145E:0000 000B

145E:0000 45 4C 45 43 54 52 4F 4E-49 43 53 00 ELECTRONICS.

-D 145F:0000 000B

145F:0000 45 4C 45 43 54 52 4F 4E-49 43 53 00 ELECTRONICS.

40

B) INSERT A STRING

PROGRAM

ASSUME CS:CODE,DS:DATA,ES:DATA

DATA SEGMENT

S1 DB "ANURAGLEGE"

S2 DB "COL"

S3 DB 0DH DUP(?)

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV ES,AX

STD

LEA SI,[S1+09H]

LEA DI,[S3+0CH]

MOV CX,04H

REP MOVSB

LEA SI,[S2+2]

MOV CX,3

REP MOVSB

41

LEA SI,[S1+5]

MOV CX,6

REP MOVSB

INT 03H

CODE ENDS

END START

42

OUTPUT:

145E:0000 000C

145E:0000 41 4E 55 52 41 47 4C 45-47 45 43 4F 4C ANURAGLEGECOL

-D 145E:000D 0020

145E:000D 41 4E 55 52 41 47 43 4F 4C 4C 45-47 45 ANURAGCOLLEGE......

43

MEMORYLOCATION OP-CODE LABEL INSTRUCTION1460:0000 B85E14 MOV AX,145E1460:0003 8ED8 MOV DS,AX1460:0005 8EC0 MOV ES,AX1460:0007 FD STD1460:0008 8D360900 LEA SI,[0009]1460:000C 8D3E1900 LEA DI,[0019]1460:0010 B90400 MOV CX,00041460:0013 F3 REPZ1460:0014 A4 MOVSB1460:0015 8D360C00 LEA SI,[000C]1460:0019 B90300 MOV CX,00031460:001C F3 REPZ1460:001D A4 MOVSB1460:001E 8D360500 LEA SI,[0005]1460:0022 B90600 MOV CX,00061460:0025 F3 REPZ1460:0026 A4 MOVSB1460:0027 CC INT 3

C) REVERSING A STRING

PROGRAM

ASSUME CS: CODE, DS: DATA ,ES: DATA

DATA SEGMENT

S1 DB "KNOWLEDGE"

S2 DB 09H DUP (?)

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV ES,AX

LEA SI,[S1]

LEA DI,[S2+8]

MOV CX,9

BACK:CLD

LODSB

44

STD

STOSB

DEC CX

JNZ BACK

INT 03H

CODE ENDS END START

OUTPUT:

MEMORY LOCATION


1460:0000 B85E14 MOV AX,145E1460:0003 8ED8 MOV DS,AX1460:0005 8EC0 MOV ES,AX1460:0007 8D360000 LEA SI,[0000]1460:000B 8D3E1100 LEA DI,[0011]1460:000F B90900 MOV CX,00091460:0012 FC CLD1460:0013 AC LODSB1460:0014 FD STD1460:0015 AA STOSB1460:0016 49 DEC CX1460:0017 75F9 JNZ 00121460:0019 CC INT 3

-D 145E:0000 0008

145E:0000 4B 4E 4F 57 4C 45 44 47-45 KNOWLEDGE

-D 145E:0009 0017

145E:0000 45 47 44 45 4C 57 4F 4E 4B EGDELWONK

45

D) DELETE CHARACTER OF STRING

PROGRAM : ASSUME CS:CODE,DS:DATA,ES:DATA

DATA SEGMENT

S1 DB "UNIVERSITY"

S2 DB 07H DUP (?)

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV ES,AX

CLD

LEA SI,S1

LEA DI,S2

MOV CX,04H

REP MOVSB

46

LEA SI,[S1+7]

MOV CX,03H

REP MOVSB

INT 03H

CODE ENDS

END START

OUTPUT:

MEMORY LOCATION


1460:0000 B85E14 MOV AX,145E1460:0003 8ED8 MOV DS,AX1460:0005 8EC0 MOV ES,AX1460:0007 FC CLD1460:0008 8D360000 LEA SI,[0000]1460:000C 8D3E0A00 LEA DI,[000A]1460:0010 B90400 MOV CX,00041460:0013 F3 REPZ1460:0014 A4 MOVSB1460:0015 8D360700 LEA SI,[0007]1460:0019 B90300 MOV CX,00031460:001C F3 REPZ1460:001D A4 REPZ1460:001E CC INT 3

AX=145E BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=000A DI=0011

DS=145E ES=145E SS=145E CS=1460 IP=001E NV UP EI PL NZ NA PO NC

1460:001E CC INT 3

47

-D 145E:0000 0009

145E:0000 55 4E 49 56 45 52 53 49-54 59 UNIVERSITY

-D 145E:000A 0010

145E:0000 55 4E 49 56 49 54 UNIVITY

E) STRING LENGTH

PROGRAM

ASSUME CS:CODE,ES:DATA

DATA SEGMENT

STG DB "ANURAG#"

CHAR DB "#"

LEN DW 00H

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV ES,AX

CLD

LEA DI,STG

MOV AL,CHAR

MOV CX,14

48

REPNE SCASB

MOV LEN,DI

INT 03H

CODE ENDS

END START

OUTPUT:

MEMORY LOCATION


145F:0000 B85E14 MOV AX,145E145F:0003 8ECO MOV ES,AX145F:0005 FC CLD145F:0006 8D3E0000 LEA DI,[0000]145F:000A 26 ES: 145F:000B A00700 MOV AL,[0007] 145F:000E B90E00 MOV CX,000E145F:0011 F2 REPNZ145F:0012 AE SCASB145F:0013 26 ES:145F:0014 893E0800 MOV [0008],DI145F:0018 CC INT 3

AX=1423 BX=0000 CX=0007 DX=0000 SP=0000 BP=0000 SI=0000 DI=0007

DS=144E ES=145E SS=145E CS=145F IP=0018 NV UP EI PL ZR NA PE NC

145F:0018 CC INT 3

49

F) STRING COMPARISION

CASE: STRINGS ARE EQUAL

ASSUME CS:CODE, DS: DATA, ES: DATA

DATA SEGMENT

S1 DB "ELECTRONICS $"


S3 DB "COMPUTER $"

MSG1 DB "STRINGS ARE EQUAL $"

MSG2 DB "STRINGS ARE NOT EQUAL $"

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV ES,AX

LEA SI,S1

50

LEA DI,S2

MOV CX,11

CLD

REP CMPSB

JNZ ABC

LEA DX,MSG1

LAST:MOV AH,09H

INT 21H

MOV AH,4CH

INT 21H

ABC:LEA DX,MSG2

JMP LAST

CODE ENDS

END START

CASE: STRINGS ARE NOT EQUAL

;COMPARE STRINGS

ASSUME CS: CODE, DS:DATA,ES:DATA

DATA SEGMENT



S3 DB "COMPUTER $"

MSG1 DB "STRINGS ARE EQUAL $"

MSG2 DB "STRINGS ARE NOT EQUAL $"

51

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV ES,AX

LEA SI,S1

LEA DI,S3

MOV CX,11

CLD

REP CMPSB

JNZ ABC

LEA DX,MSG1

LAST:MOV AH,09H

INT 21H

MOV AH,4CH

INT 21H

ABC:LEA DX,MSG2

JMP LAST

CODE ENDS

END START

52

OUTPUT:

1463:0000 B85E14 MOV AX,145E

1463:0003 8ED8 MOV DS,AX

1463:0005 8EC0 MOV ES,AX

1463:0007 8D360000 LEA SI,[0000]

1463:000B 8D3E0D00 LEA DI,[000D]

1463:000F B90B00 MOV CX,000B

1463:0012 FC CLD

1463:0013 F3 REPZ

1463:0014 A6 CMPSB

1463:0015 750C JNZ 0023

1463:0017 8D162400 LEA DX,[0024]

1463:001B B409 MOV AH,09

1463:001D CD21 INT 21

1463:001F B44C MOV AH,4C

-1463:0014 A6 CMPSB

53

1463:0015 750C JNZ 0023

1463:0017 8D162400 LEA DX,[0024]

1463:001B B409 MOV AH,09

1463:001D CD21 INT 21

1463:001F B44C MOV AH,4C

1463:0021 CD21 INT 21

STRINGS ARE EQUAL

1463:0000 B85E14 MOV AX,145E

1463:0003 8ED8 MOV DS,AX

1463:0005 8EC0 MOV ES,AX

1463:0007 8D360000 LEA SI,[0000]

1463:000B 8D3E1A00 LEA DI,[001A]

1463:000F B90B00 MOV CX,000B

1463:0012 FC CLD

1463:0013 F3 REPZ

1463:0014 A6 CMPSB

1463:0015 750C JNZ 0023

1463:0017 8D162400 LEA DX,[0024]

1463:001B B409 MOV AH,09

1463:001D CD21 INT 21

1463:001F B44C MOV AH,4C

1463:0021 CD21 INT 21

54

STRINGS ARE NOT EQUAL

55

EXP.NO.5: PROGRAM FOR DIGITAL CLOCK DESIGN USING8086.

AIM: To write an ALP program for displaying the system clock.

APPARATUS: 1.MASM

PROGRAM:


DATA SEGMENT

MESSAGE DB 'CURRENT TIME IS:$'

HR DB ?

MIN DB ?

SEC DB ?

MSEC DB ?

DATA ENDS

CODE SEGMENT

START:

MOV AX,DATA

MOV DS,AX

MOV AH,2CH

INT 21H

MOV HR,CH

MOV MIN,CL

MOV SEC,DH

MOV MSEC,DL

MOV AH,09H

LEA DX,MESSAGE

56

INT 21H

MOV AL,HR

AND AL,AL

AAM

MOV BX,AX

CALL DISPLAY

MOV DL,':'

MOV AH,02H

INT 21H

MOV AL,MIN

AAM

MOV BX,AX

CALL DISPLAY

MOV DL,':'

MOV AH,02H

INT 21H

MOV AL,SEC

AAM

MOV BX,AX

CALL DISPLAY

MOV DL,'.'

MOV AH,02H

INT 21H

MOV AL,MSEC

AAM

57

MOV BX,AX

CALL DISPLAY

MOV AH,4CH

INT 21H

DISPLAY PROC NEAR

MOV DL,BH

ADD DL,30H

MOV AH,02H

INT 21H

MOV DL,BL

ADD DL,30H

MOV AH,02H

INT 21H

RET

DISPLAY ENDP

CODE ENDS

END START

OUTPUT:

1444:0000 B84214 MOV AX,1442

1444:0003 8ED8 MOV DS,AX

1444:0005 B42C MOV AH,2C

1444:0007 CD21 INT 21

1444:0009 882E1100 MOV [0011],CH

1444:000D 880E1200 MOV [0012],CL

58

1444:0011 88361300 MOV [0013],DH

1444:0015 88161400 MOV [0014],DL

1444:0019 B409 MOV AH,09

1444:001B 8D160000 LEA DX,[0000]

1444:001F CD21 INT 21

1444:0021 A01100 MOV AL,[0011]

1444:0024 22C0 AND AL,AL

1444:0026 D40A AAM

1444:0028 8BD8 MOV BX,AX

1444:002A 83400 CALL 0061

1444:002D B23A MOV DL,3A

1444:002F B402 MOV AH,02

1444:0031 CD21 INT 21

1444:0033 A01200 MOV AL,[0012]

1444:0036 D40A AAM

1444:0038 8BD8 MOV BX,AX

1444:003A E82400 CALL 0061

1444:003D B23A MOV DL,3A

1444:003F B402 MOV AH,02

1444:0041 CD21 INT 21

1444:0043 A01300 MOV AL,[0013]

1444:0046 D40A AAM

1444:0048 8BD8 MOV BX,AX

59

1444:004A E81400 CALL 0061

1444:004D B22E MOV DL,2E

1444:004F B402 MOV AH,02

1444:0051 CD21 INT 21

1444:0053 A01400 MOV AL,[0014]

1444:0056 D40A AAM

1444:0058 8BD8 MOV BX,AX

1444:005A E80400 CALL 0061

1444:005D B44C MOV AH,4C

1444:005F CD21 INT 21

1444:0061 8AD7 MOV DL,BH

1444:0063 80C230 ADD DL,30

1444:0066 B402 MOV AH,02

1444:0068 CD21 INT 21

1444:006A 8AD3 MOV DL,BL

1444:006C 80C230 ADD DL,30

1444:006F B402 MOV AH,02

1444:0071 CD21 INT 21

1444:0073 C3 RET

CURRENT TIME IS:14:40:47.44

60

EXP.NO.6: INTERFACING ADC AND DAC TO 8086.

AIM:1. To write a program for conversion of analog data to digital output.2. To write a program for conversion of digital data to analog output. The analog outputwill be in the form of triangular wave, saw tooth wave, square wave/rectangular wave.

APPARATUS:1. 8086 Trainer.2. Power supply for trainer and interface module.3. A/D, D/A interface module.4. Power mate connector.5. FRC connector.6. Cathode ray oscilloscope.

PROGRAM:

;8 bit ADC 0809 (SUCCESIVE APPROX. METHOD), 100 microsec.

;convertion time is used to convert voltage signal

;simulated by on board pot. It provided varying voltage

;0 to 5v,connected to channel no.1. Processor interface

;is provided via 26 pin FRC.

ADC SEGMENT

ASSUME CS:ADC

CR55 EQU 8807H

PORTB EQU 8803H

PORTC EQU 8805H

ORG 100H

START:

MOV AX,0000H

MOV ES,AX

61

MOV SS,AX

MOV AX,11F0H ;Init .SP

MOV SP,AX

PUSH CS ;Set CS=DS

POP DS

MOV DX,CR55 ;Init port A,B

MOV AL,81H ;C(upper) as OP

OUT DX,AL ;C(lower) as IP

MOV DX,PORTB

MOV AL,00H

OUT DX,AL

MOV DX,CR55

MOV AL,09H ;Set PC4(ALE) bit

OUT DX,AL ;high

MOV AL,08H ;Set PC4 bit to

OUT DX,AL ;latch

MOV AL,83H ;Set portB as IP

OUT DX,AL ;rest same as before

INT 0ACH

COVN: MOV DX,CR55 ;Set PC6(start of

MOV AL,0DH ;convertion)

OUT DX,AL

MOV AL,0CH

62

OUT DX, AL

MOV DX, PORTC

BACK: IN AL, DX ;Check PC1(EOC) low

AND AL, 02H ;to insure convertion

JNZ BACK

COVNCHK: IN AL, DX ;Convertion really

AND AL, 02H ;Completed

JZ COVNCHK ;Yes, then set

MOV AL, 0BH ; PC5(OE) to read

MOV DX, CR55

OUT DX, AL

MOV DX, PORTB ;Read digital data

IN AL, DX

MOV CL, AL

MOV DX, CR55

MOV AL, 0AH

OUT DX, AL

INT 0ABH

MOV AL, 02H

MOV DX, CX

NOP

MOV DH,00H

INT 0AEH

63

MOV AH,0BH

INT 0A1H

AND AL,0FFH

JZ COVN ;Start next sample

INT 0A3H ;Return to monitor

ADC ENDS

END STRT

OUTPUT: By changing the POT we can observe the equal lent digital value on the lcd screen

0100 B8 0000 START: MOV AX,0000H

0103 8E C0 MOV ES,AX

0105 8E D0 MOV SS,AX

0107 B8 F0 11 MOV AX,11F0H ;Init .SP

010A 89 C4 MOV SP,AX

010C 0E PUSH CS ;Set CS=DS

010D 1F POP DS

010E BA 07 88 MOV DX,CR55 ;Init port A,B

0111 B0 81 MOV AL,81H ;C(upper) as OP

0113 EE OUT DX,AL ;C(lower) as IP

0114 BA 03 88 MOV DX,PORTB

0117 B0 00 MOV AL,00H

0119 EE OUT DX,AL

011A BA 07 88 MOV DX,CR55

011D B0 09 MOV AL,09H ;Set PC4(ALE) bit

011F EE OUT DX,AL ;high

64

0120 B0 08 MOV AL,08H ;Set PC4 bit to

0122 EE OUT DX,AL ;latch

0123 B0 83 MOV AL,83H ;Set portB as IP

0125 EE OUT DX,AL ;rest same as before

0126 CD AC INT 0ACH

0128 BA 07 88 COVN: MOV DX,CR55 ;Set PC6(start of

012B B0 0D MOV AL,0DH ;convertion)

012D EE OUT DX,AL

012E B0 0C MOV AL,0CH

0130 EE OUT DX,AL

0131 BA 05 88 MOV DX,PORTC

0134 EC BACK: IN AL,DX ;Check PC1(EOC) low

0135 24 02 AND AL,02H ;to insure convertion

0137 75 FB JNZ BACK

0139 EC COVNCHK: IN AL,DX ;Convertion really

013A 24 02 AND AL,02H ;Completed

013C 74 FB JZ COVNCHK ;Yes, then set

013E B0 0B MOV AL,0BH ;PC5(OE) to read

0140 BA 07 88 MOV DX,CR55

0143 EE OUT DX,AL

0144 BA 03 88 MOV DX,PORTB ;Read digital data

0147 EC IN AL,DX

0148 88 C1 MOV CL,AL

014A BA 07 88 MOV DX,CR55

65

014D B0 0A MOV AL,0AH

014F EE OUT DX,AL

0150 CD AB INT 0ABH

0152 B0 02 MOV AL,02H

0154 89 CA MOV DX,CX

0156 90 NOP

0157 B6 00 MOV DH,00H

0159 CD AE INT 0AEH

015B B4 0B MOV AH,0BH

015D CD A1 INT 0A1H

015F 24 FF AND AL,0FFH

0161 74 C5 JZ COVN ;Start next sample

0163 CD A3 INT 0A3H ;Return to monitor

0165 90 ADC ENDS

END STRT

66

PROGRAM FOR DIGITAL TO ANALOG CONVERTOR

PROGRAM:

ASSUME CS: CODE

CODE SEGMENT

START:

MOV DX, 8006H

MOV AL, 80H

OUT DX.AL

MOV AL, 00H

MOV DX, 8000H

UP: OUT DX, AL

INC AL

JMP UP

RET

CODE ENDS

END START

67

OUTPUT :we can observe the output on CRO

1442:0000 BA0680 MOV DX,8006

1442:0003 B080 MOV AL,80

1442:0005 EE OUT DX,AL

1442:0006 BA0080 MOV DX,8000

1442:0009 B000 MOV AL,00

1442:000B EE OUT DX,AL

1442:000C FEC0 INC AL

1442:000E EBFB JMP 000B

1442:0010 C3 RET

68

EXP.NO.7: PARALLEL COMMUNICATION BETWEEN TWOMICROPROCESSORS

USING 8255.AIM: To write an alp for parallel communication between two microprocessors by using 8255.

APPARATUS: 8086 Trainer kit-2, 8255, Power Supply and connectors.

PROCEDURE:1) Connect 8255 card (Periware – 3) to your kit through 50 pin FRC.2) Connect port A tags to GND, and Vcc through patch cords, 3) Make S1 towards you to enable Single Stepping.4) Connect PC4 tag with patch cord to Vcc.5) Connect PC3 tag to RST 5.5 tag through patch cord.6) L18 (on MB) position should be 2-3 short & L3 on converter card position should be 1-2.7) Enter the software code as given in list 3(A).8) Execute the program by pressing G, CR, CR, SR_SEGM 145E, CR, ADDR 0100, CR &

observe

PROGRAM:

0103 B8 10FF MOV AX,10FFH ;Init of SP for Kit

0106 8B E0 MOV SP,AX ;On PC

0108 0E PUSH CS ;Init for DS

0109 58 POP AX ;Load kit INTS

010A 8E D8 MOV DS,AX ;(A0-BF)

010C 90 NOP ;In PC using

010D 90 NOP ;CALL in place

010E 90 NOP ;of 3 NOP`S

010F B8 0000 MOV AX,0000H ;Load ES as 0000H


0114 B0 90 MOV AL,90H ; Control Word for Mode 0, ;A-input

0116 BA 01E6 MOV DX,01E6H ; CSW Address in DX

0119 EE OUT DX,AL ; Write csw (OUT 90 to 01E6H)

69

011A BA 01E0 MOV DX,01E0H ; Port A Address in DX

011D EC IN AL,DX ; Read port A ( IN from 01E0H)

011E ISR055:

011E 26: A2 1000 MOV ES:[1000H],AL ; Store received data in memory.

0122 CD AC INT 0ACH ;Clear display

0124 BB 0140 R MOV BX,OFFSET MSG ;LXI H,00H 43H, Pointer for

;look up table.

0127 CD AF INT 0AFH ;CALL OUTMSG, Calls display

;routine.

0129 B3 01 MOV BL,01H ; Set counter for delay.(C)

012B B9 00FF LOOP: MOV CX,00FFH ;LXI D,FFH FFH, Wait to stabilise

the display.

012E CD AA INT 0AAH ;Call delay, Calls delay routine.

0130 26: A0 1000 MOV AL,ES:[1000H] ;Retrive port A received data for

;display purpose.

0134 8A D0 MOV DL,AL

0136 B0 02 MOV AL,02H ; Number of digits to be

; displayed in data segment.

0138 CD AE INT 0AEH ;CALL NMOUT, NM OUT routine is013A FE CB DEC BL

013C 75 ED JNZ LOOP

013E CD A4 INT 0A4H ;GOTO Command Mode.

0140 50 4F 54 41 20 20 MSG: DB "POTA ",03H ; End of text. 03

0147 X86P55A1 ENDS

END STRT

70

OUTPUT:

Data CS RD WR A0 A1 Comments

Bus

Start 90 L - L 1 1 Control Word Mode 0,

port A - input.

Step1 DATA L L - - - Read data from port A.

Step2 - - - - - - Shows input data on kit display .

71

EXP.NO.8: Serial communication between two microprocessor kits using8251

AIM: Interface the 8251 USART to the two 8086 microprocessor kits.

APPARATUS:1. 8086 Trainer kit - 2no s‟2. 8251 USART3. Power Supply4. Connectors.

PROCEDURE: 1) Connect the 8251 card to your kit through pin FRC. As shown in interfacing diagram.2) Connect TxC tag to clk SRC tag, DSR tag to GND, TxD tag to RxD tag.3) Make S1 towards you to enable Single Stepping.4) Check 2-3 of L18 is shorted using short link on MB.5) Check 1-2 of L3 is shorted using short link on converter card.6) Check 1-2 of L35 is open (should not short)7) Enter the software code as given in list 1(A).8) Execute the program by pressing G, CR, CR, 149F, CR, 0100 CR & observe

following results on the LEDs.

PROGRAM:

MOV AX,10FFH ;Initof SP for Kit

MOV SP,AX ;On PC

PUSH CS ;Init for DS

POP AX ;Load kit INTS

MOV DS,AX ;(A0-BF)

NOP ;In PC using

NOP ;CALL in place

NOP ;of 3 NOP`S

MOV AX,0000H

MOV ES,AX

MOV AL,00H ; Dummy code.

72

MOV DX,01E2H

OUT DX,AL

INT 0ACH ; Clear screen. Give delay.

OUT DX,AL ; Dummy code.

INT 0ACH

OUT DX,AL ; Dummy code.

INT 0ACH

MOV AL,40H

OUT DX,AL ; Reset code

INT 0ACH

MOV AL,4DH

OUT DX,AL ; Mode word, Stop Bits=1,

; Character Length=8 Bits

INT 0ACH ; Baud Rate Factor = 1

MOV AL,27H

OUT DX,AL ; Command Word, Rx

; Enable=1, TxEnable=1

; DSR=1

LOOP1:

IN AL,DX ; Check for transmitter ready.

AND AL,81H; If no then remain in loop and ; wait.

CMP AL,81H

JNZ LOOP1

POP BX ; Remove programme counter ; from stack.

INT 0ACH ; Set cursor to left.

73

MOV BX,OFFSET MSGBY ; Pointer for look up table

MOV AL, 02H

MOV AH,10H

INT 0B9H ; Routine to receive number

MOV AL,DL

MOV DX,01E0H

OUT DX,AL ; Send data to Transmitter Buffer

LOOP2:

MOV DX,01E2H

IN AL,DX ; Check for receiver ready.

AND AL,02H; If no then remain in loop and ; wait.

CMP AL,02H

JNZ LOOP2

MOV DX,01E0H

IN AL,DX ; Receive the data from; receiver output.

CALL DSPLY; Displays the byte on seven ; segments

INT 0A4H ; Go to Command Mode.; without disturbing display.

DSPLY PROC NEAR

INT 0ACH

MOV ES:[1000H],AL ; Store received data in memory

MOV BX,OFFSET MSGDA; Pointer for look up table.

INT 0AFH ; Calls display routine

MOV DL,20H ;Out ascii space charater

MOV AH,02H

INT 0A2H

74

MOV DL,20H ;Out ascii space char.

MOV AH,02H

INT 0A2H

LOOP3:

MOV CX,0FFFFH ; Wait to stabilise the display

INT 0AAH ; Calls delay routine

MOV AL,02H ; Number of digits to be displayed ; in data segment.

MOV DL,ES:[1000H] ; Load the data back to the ACC

INT 0AEH ; NMOUT routine is called

RET

DSPLY ENDP

MSGDA: DB "DATA", 03H

MSGBY: DB "BYTE", 03H

X86P511A ENDS

END STRT

75

OUTPUT:

0103 SKIP_DATA:

0103 B8 10FF MOV AX,10FFH ;Initof SP for Kit

0106 8B E0 MOV SP,AX ;On PC

0108 0E PUSH CS ;Init for DS

0109 58 POP AX ;Load kit INTS

010A 8E D8 MOV DS,AX ;(A0-BF)

010C 90 NOP ;In PC using

010D 90 NOP ;CALL in place

010E 90 NOP ;of 3 NOP`S

010F B8 0000 MOV AX,0000H


0114 B0 00 MOV AL,00H ; Dummy code.

0116 BA 01E2 MOV DX,01E2H

0119 EE OUT DX,AL

011A CD AC INT 0ACH ; Clear screen. Give delay.

011C EE OUT DX,AL ; Dummy code.

011D CD AC INT 0ACH

011F EE OUT DX,AL ; Dummy code.

0120 CD AC INT 0ACH

0122 B0 40 MOV AL,40H

0124 EE OUT DX,AL ; Reset code

0125 CD AC INT 0ACH

0127 B0 4D MOV AL,4DH

0129 EE OUT DX,AL; Mode word, Stop Bits=1, Character Length=8 Bits

76

012A CD AC INT 0ACH ; Baud Rate Factor = 1

012C B0 27 MOV AL,27H

012E EE OUT DX,AL ; Command Word, Rx ; Enable=1, TxEnable=1 ; DSR=1

012F LOOP1:

012F EC IN AL,DX ; Check for transmitter ready.

0130 24 81 AND AL,81H; If no then remain in loop and; wait.

0132 3C 81 CMP AL,81H

0134 75 F9 JNZ LOOP1

0136 5B POP BX ; Remove programme counter ; from stack.

0137 CD AC INT 0ACH ; Set cursor to left.

0139 BB 0186 R MOV BX,OFFSET MSGBY ; Pointer for look up table

013C B0 02 MOV AL, 02H

013E B4 10 MOV AH,10H

0140 CD B9 INT 0B9H ; Routine to receive number

0142 8A C2 MOV AL,DL


0147 EE OUT DX,AL ; Send data to Transmitter Buffer

0148 LOOP2:


014B EC IN AL,DX ; Check for receiver ready.

014C 24 02 AND AL,02H; If no then remain in loop and; wait.

014E 3C 02 CMP AL,02H

0150 75 F6 JNZ LOOP2


0155 EC IN AL,DX; Receive the data from; receiver output.

77

0156 E8 015B R CALL DSPLY; Displays the byte on seven ; segments

0159 CD A4 INT 0A4H ; Go to Command Mode.; without disturbing display.

015B DSPLY PROC NEAR

015B CD AC INT 0ACH

015D 26: A2 1000 MOV ES:[1000H],AL ; Store received data in mem

0161 BB 0181 R MOV BX,OFFSET MSGDA; Pointer for look up table

0164 CD AF INT 0AFH ; Calls display routine

0166 B2 20 MOV DL,20H ;Out ascii space charater

0168 B4 02 MOV AH,02H

016A CD A2 INT 0A2H

016C B2 20 MOV DL,20H ;Out ascii space char.

016E B4 02 MOV AH,02H

0170 CD A2 INT 0A2H

0172 LOOP3:

0172 B9 0FFF MOV CX,0FFFH ; Wait to stabilise the display

0175 CD AA INT 0AAH ; Calls delay routine

0177 B0 02 MOV AL,02H; Number of digits to be displayed ; in datasegment.

0179 26: 8A 16 1000 MOV DL,ES:[1000H] ; Load the data back to the ACC

017E CD AE INT 0AEH ; NMOUT routine is called

0180 C3 RET

0181 DSPLY ENDP

0181 44 41 54 41 03 MSGDA: DB "DATA", 03H

0186 42 59 54 45 03 MSGBY: DB "BYTE", 03H

018B X86P511A ENDS

END START

78

Data

Bus CS C/D

RD

Rx

RDy

Tx

RDy

WR

TxC

IO/M

RxD

DTR

RTS DSR

TxD TxE

CTS

SYN/BD

Comments

Start 00 L 1 - - - L - 1 1 - - L 1 1 - - Dummy Code

Step1 00 L 1 - - - L - 1 1 - - L 1 1 - - Dummy Code

Step2 00 L 1 - - - L - 1 1 - - L 1 1 - - Dummy Code

Step3 40 L 1 - - - L - 1 1 - - L 1 1 - - Reset 8251

Step4 4D L 1 - - - L - 1 1 - - L 1 1 - - Mode word, 8 Bit no. no of stop Bits=1 Baud rate factor = 1

Step5 27 L 1 - - - L - 1 1 - - L 1 - - - Command word, RTS output=0, DTR output=0, Enable Receiver, Transmitter

Step6 85 L 1 L - 1 - - 1 1 L L L 1 1 - - Reads status ofBit “TxRDy” it can be visualised on LED.

Step7 - - - - - Displays “BYTE” on XPO kit Enterdata through keyboard and press “CR” forEx. “AA”-“CR”

Step8 80 L 1 L - - - - 1 1 L L L 1 - - - Data is ready in Trasmitter Buffer to be transmitted

Step9 81 L 1 L - 1 - - 1 1 L L L 1 - - - Checking the

79

status of TxD pin for “ONE”before sendingthe Start Bit.

Step10 81 L 1 L - 1 - - 1 0 L L L 0 - - - The data is serially being transmitted and received through serial port. Start Bit=0

Step11 81 L 1 L - 1 - - 1 0 L L L 0 - - - D0=0

Step12 81 L 1 L - 1 - - 1 1 L L L 1 - - - D1=1

Step13 81 L 1 1 - 1 - - 1 0 L L L 0 - - - D2=0

Step14 81 L 1 1 - 1 - - 1 1 L L L 1 - - - D3=1

Step15 81 L 1 1 - 1 - - 1 0 L L L 0 - - - D4=0

Step16 81 L 1 1 - 1 - - 1 1 L L L 1 - - - D5=1

Step17 81 L 1 1 - 1 - - 1 0 L L L 0 - - - D6=0

Step18 81 L 1 1 - 1 - - 1 1 L L L 1 - - - D7=1

Step19 87 L 1 1 1 1 - - 1 1 L L L 1 1 - - Stop Bit=1 data is available on 8251 which is to be read

Step20 AA L 0 L - 1 - - 1 1 L L L 1 1 - - Data is being read from Receiver Buffer.

Step21 ------------ Data will be displayed on display of XPO kit

.EXP.NO.9: INTERFACING TO 8086 AND PROGRAMMING TO CONTROL STEPPER MOTOR

AIM: Write an Assembly Language Program to rotate the Stepper Motor in clockwise as wellas anti-clockwise direction.

80

APPARATUS: 8086 Trainer kit, Stepper,Motor Interface Card,Stepper Motor,Power supply.

PROGRAM:(STEPPER CLOCK WISE)

ASSUME CS:CODE

CODE SEGMENT

START: MOV DX,8006H

MOV AL,80H

OUT DX,AL

MOV DX,8000H

MOV AL,88H

BACK:OUT DX,AL

CALL DELAY

ROR AL,01H

JMP BACK

DELAY:MOV CX,0FFFH

L1:DEC CX

JNZ L1

RET

CODE ENDS

END START

PROGRAM: (ANTICLOCK WISE)

ASSUME CS: CODE

CODE SEGMENT

START:

81

MOV DX,8006H

MOV AL,80H

OUT DX,AL

MOV DX,8000H

MOV AL,88H

BACK:OUT DX,AL

CALL DELAY

ROL AL,01H

JMP BACK

DELAY:MOV CX,0FFFH

L1:DEC CX

JNZ L1

RET

CODE ENDS

END START

OUTPUT: (STEPPER CLOCK WISE)

145E:0000 BA0680 MOV DX,8006

145E:0003 B080 MOV AL,80

145E:0005 EE OUT DX,AL

82

145E:0006 BA0080 MOV DX,8000

145E:0009 B088 MOV AL,88

145E:000B EE OUT DX,AL

145E:000C E80400 CALL 0013

145E:000F D0C8 ROR AL,1

145E:0011 EBF8 JMP 000B

145E:0013 B9FF0F MOV CX,0FFF

145E:0016 49 DEC CX

145E:0017 75FD JNZ 0016

145E:0019 C3 RET

OUTPUT: (STEPPER ANTI-CLOCK WISE )

145E:0000 BA0680 MOV DX,8006

145E:0003 B080 MOV AL,80

145E:0005 EE OUT DX,AL

83

145E:0006 BA0080 MOV DX,8000

145E:0009 B088 MOV AL,88

145E:000B EE OUT DX,AL

145E:000C E80400 CALL 0013

145E:000F D0C0 ROL AL,1

145E:0011 EBF8 JMP 000B

145E:0013 B9FF0F MOV CX,0FFF

145E:0016 49 DEC CX

145E:0017 75FD JNZ 0016

145E:0019 C3 RET

84

EXP.NO.10: PROGRAMMING USING ARITHMETIC, LOGICALAND BIT MANIPULATIONINSTRUCTIONS OF 8051.

A)ARITHMETIC OPERATIONS

AIM: To perform arithmetic operations by using 8051.

APPARATUS: 1.8051 with keyboard

2.keil software

PROGRAM:

ORG 00H

MOV A,#08H

ADD A,#02H

MOV R0,A

SUBB A,#01H

MOV R1,A

MOV B,#03H

MUL AB

MOV R2,A

MOV R3,B

MOV B,#03H

DIV AB

MOV R4,A

MOV R5,B

HERE:SJMP HERE

END

85

OUTPUT:

86

B) LOGICAL OPERATIONS

AIM: To perform arithmetic operations by using 8051.

APPARATUS: 8051 with keyboard & keil software

PROGRAM:

ORG 00H

MOV A,#08H

ANL A,#02H

MOV R0,A

ORL A,#01H

MOV R1,A

XRL A,#44H

MOV R2,A

CPL A

MOV R4,A

SETB C

CLR P1.3

HERE:SJMP HERE

END

88

OUTPUT:

89

EXP.NO.11: PROGRAM AND VERIFY TIMER/COUNTER IN 8051AIM: To Perform Timer 0 and Timer 1 in Counter Mode and Gated Mode Operation.

APPARATUS: 8051kit with keyboard,& keil software.

PROGRAM:

ORG 00H

MOV TMOD,#01H

START:MOV TH0,#0FEH

MOV TL0,#031H

SETB TR0

JNB TF0,$

CPL P1.0

CLR TR0

CLR TF0

SJMP START

END

90

OUTPUT:

91

EXP.NO.12: PROGRAM AND VERIFY INTERRUPT HANDLING IN8051.

AIM: Write ALP in 8051 to allow the external interrupt 1.

APPARATUS: 8051 with keyboard interrupt kit module.

PROGRAM:

A: EQU 0E0H

B: EQU 0F0H

R0: EQU 00H ;REGISTER BANK-0

R1: EQU 01H

R2: EQU 02H

R3: EQU 03H

R4: EQU 04H

R5: EQU 05H

R6: EQU 06H

R7: EQU 07H

SP: EQU 81H ;STACK POINTER

TMOD: EQU 89H ;TIMER MODE REG.

TCON: EQU 88H ;TIMER CONTROL REG.

TH0: EQU 8CH ;TIMER-0 REG.HIGH BYTE

TL0: EQU 8AH ;TIMER-0 REG.LOW BYTE

TH1: EQU 8DH ;TIMER-1 REG.HIGH BYTE

TL1: EQU 8BH ;TIMER-1 REG.LOW BYTE

DPL: EQU 82H ;16-BIT "DPTR" POINTER

DPH: EQU 83H

92

DPTR: EQU DPL

SPDTF0: EQU 2023H ;EXT.MEM.SCPD.VECTOR ADDR.FOR TF0

SPDTF1: EQU 2029H ;EXT.MEM.SCPD.VECTOR ADDR.FOR TF1

CUR: EQU 2010H

IE0: EQU 2020H

IE1: EQU 2026H

PERIPHERAL EQUATES

; FOR 8031/V51 KIT ; FOR UNI-8 KIT,8031 MODULE

UPA55: EQU 2808H ; UPA55: EQU 2800H

UPB55: EQU 2809H ; UPB55: EQU 2801H

UPC55: EQU 280AH ; UPC55: EQU 2802H

UCS55: EQU 280BH ; UCS55: EQU 2803H

DTA79: EQU 2800H ; DTA79: EQU 2810H

CW79: EQU 2801H ; CW79: EQU 2811H

;---- MONITOR UTILITIES USED IN PROGRAMS EQUATES ---

;---- ONLY THE NECESSARY MON.UTILITIES ARE LISTED HERE --

CRLF: EQU 061DH

WR79: EQU 062CH

WRSR: EQU 01F3H

RDBUF: EQU 0230H

NOUT: EQU 059EH

DELAY: EQU 0114H

RCVN: EQU 045FH

93

TST79: EQU 0503H

MSGOUT: EQU 0606H

NMIN: EQU 047BH

CMDMOD: EQU 06D8H

CMDWDP: EQU 06DBH

WRTCR: EQU 03D8H

TERN: EQU 06CDH

TEST: EQU 2000H

READ: EQU 2003H

WRITE: EQU 2006H

; * PROGRAM - 5) USING INTERRUPTS OF 8031.

; THIS PROGRAM TO BE DOWNLOADED & EXECUTED AT 6280H

ORG 61E0H

;MAIN

INTRPT: MOV 0A8H,#00H ;PUT OFF ALL INTS.

SETB 8AH ;INT1 SET FOR FALLING EDGE TRIGGER

; IF YOU WANT TO USE INT-0 IN THE PLACE OF INT-1 THEN

; REPLACE THE IMMEDIATLY ABOVE INSTRUCTION WITH

; SETB 88H ;INT-0 SET FOR FALLING EDGE TRIGGER

MOV DPTR,#ISR1 ;ADDS OF ISR.

MOV R3,DPL ;LOWER IN R3

MOV R4,DPH ;HIGHER IN R4

MOV DPTR,#IE1 ;VECTOR-FOR INT1 IN SCPD.RAM(2026H)

94



; MOV DPTR,#IE0 ;INT-0 VECTOR INIT. IN SCPD.RAM (2020H)

LCALL TERN ;INIT A VECTOR IN SCPD RAM;i.e. 'JMP ISR1'

LUP1: LCALL CRLF

MOV DPTR,#MSG1 ;POINT TO MSG ;"JAIHIND"

LCALL MSGOUT ;O/P A STRING.

HERE: JB 0B3H,HERE ;WAIT TILL INT1 LINE IS HIGH



; JB 0B2H,HERE ;WAIT TILL INT0 LINE HIGH

MOV 0A8H,#84H ;ENABLE INT1



; MOV 0A8H,#81H ;ENABLE INT-0

NOP

NOP ;LET 8031 TAKE

;THE INTERUPT

SJMP LUP1

;NOW GIVE A LOW GOING PULSE TO INT1 ON PIN 15 OF HEADER.

;YOU MAY APPLY THE PULSE BY MOMENTARY SHORTING PIN 2(GND)

;& PIN 15 (INT-1) OF HEADER BY A WIRE.ANY WAY THIS IS A SHORTCUT

;& IF YOU ARE USING INT-0 THEN PIN-1(INT-0) IN PLACE OF PIN-15

;ISR FOR INT1.

ISR1: MOV 0A8H,#00H ;DISABLE ALL INTS.

95

ISRN: JNB 0B3H,ISRN ;DEBOUNCE..

IF YOU WANT TO USE INT-0 IN THE PLACE OF INT-1 THEN


; JNB 0B2H,ISRN ;DEBOUNCE...

MOV R0,#0FFH

DBON: DJNZ R0,DBON ;DELAY DEBOUNCE

JNB 0B3H,ISRN ;CHK STILL..



; JNB 0B2H,ISRN ;CHK STILL..

LCALL CRLF

MOV DPTR,#MSG2

LCALL MSGOUT ;O/P MSG."ANSH 51"

MOV R0,#05H

MOV R1,#0FFH

MOV R2,#0FFH

MORD: LCALL DELAY ;PASS TIME.

DJNZ R0,MORD ;MORE DELAY

RETI ;RETURN FROM INT.

MSG1:DFB "JAIHIND",03H ;MAIN DISPLAY

MSG2:DFB "ANSH 51",03H ;ISR DISPLAY

96

OUTPUT:

. 00E0 = A: EQU 0E0H

00F0 = B: EQU 0F0H

0000 = R0: EQU 00H ;REGISTER BANK-0

0001 = R1: EQU 01H

0002 = R2: EQU 02H

0003 = R3: EQU 03H

0004 = R4: EQU 04H

0005 = R5: EQU 05H

0006 = R6: EQU 06H

0007 = R7: EQU 07H

0081 = SP: EQU 81H ;STACK POINTER

0089 = TMOD: EQU 89H ;TIMER MODE REG.

0088 = TCON: EQU 88H ;TIMER CONTROL REG.

008C = TH0: EQU 8CH ;TIMER-0 REG.HIGH BYTE

008A = TL0: EQU 8AH ;TIMER-0 REG.LOW BYTE

008D = TH1: EQU 8DH ;TIMER-1 REG.HIGH BYTE

008B = TL1: EQU 8BH ;TIMER-1 REG.LOW BYTE

0082 = DPL: EQU 82H ;16-BIT "DPTR" POINTER

0083 = DPH: EQU 83H

0082 = DPTR: EQU DPL

2023 = SPDTF0: EQU 2023H ;EXT.MEM.SCPD.VECTOR ADDR.FOR TF0

2029 = SPDTF1: EQU 2029H ;EXT.MEM.SCPD.VECTOR ADDR.FOR TF1

2010 = CUR: EQU 2010H

97

2020 = IE0: EQU 2020H

2026 = IE1: EQU 2026H

;---- PERIPHERAL EQUATES ----------

; FOR 8031/V51 KIT ; FOR UNI-8 KIT,8031 MODULE

2808 = UPA55: EQU 2808H ; UPA55: EQU 2800H

2809 = UPB55: EQU 2809H ; UPB55: EQU 2801H

280A = UPC55: EQU 280AH ; UPC55: EQU 2802H

280B = UCS55: EQU 280BH ; UCS55: EQU 2803H

2800 = DTA79: EQU 2800H ; DTA79: EQU 2810H

2801 = CW79: EQU 2801H ; CW79: EQU 2811H

;---- MONITOR UTILITIES USED IN PROGRAMS EQUATES ---

;---- ONLY THE NECESSARY MON.UTILITIES ARE LISTED HERE --

061D = CRLF: EQU 061DH

062C = WR79: EQU 062CH

01F3 = WRSR: EQU 01F3H

0230 = RDBUF: EQU 0230H

059E = NOUT: EQU 059EH

0114 = DELAY: EQU 0114H

045F = RCVN: EQU 045FH

0503 = TST79: EQU 0503H

0606 = MSGOUT: EQU 0606H

047B = NMIN: EQU 047BH

98

06D8 = CMDMOD: EQU 06D8H

06DB = CMDWDP: EQU 06DBH

03D8 = WRTCR: EQU 03D8H

06CD = TERN: EQU 06CDH

2000 = TEST: EQU 2000H

2003 = READ: EQU 2003H

2006 = WRITE: EQU 2006H

; * PROGRAM - 5) USING INTERRUPTS OF 8031.

;

; THIS PROGRAM ILLUSTRATES HOW TO USE EXTERNAL INTERRUPTS

; (INT-0 & INT-1) OF 8031. HOW TO INIT & HOW TO WRITE ISR

; FOR INTERRUPT. IN THIS PROGRAM IN MAIN LOOP "JAIHIND"

; IS DISPLAYED. NOW APPLYING A PULSE (HIGH TO LOW TRANSITION)

; TO PIN-15 ON HEADER (i.e. INT1 OF 8031). IN THE "ISR" FOR

; "INT-1" IT DISPLAYS "ANSH 51" FOR DURATION SET BY DELAY.

; USER CAN ALSO TRY OUT USING "INT-0" LINE OF 8031, BUT IN

; THAT CASE "SINGLE STEPPING" CAN NOT BE USED.

; THIS PROGRAM TO BE DOWNLOADED & EXECUTED AT 6280H

61E0 ORG 61E0H

;MAIN

61E0 75A800 INTRPT: MOV 0A8H,#00H ;PUT OFF ALL INTS.

61E3 D28A SETB 8AH ;INT1 SET FOR FALLING EDGE TRIGGER

99



; SETB 88H ;INT-0 SET FOR FALLING EDGE TRIGGER

61E5 906205 MOV DPTR,#ISR1 ;ADDS OF ISR.

61E8 AB82 MOV R3,DPL ;LOWER IN R3

61EA AC83 MOV R4,DPH ;HIGHER IN R4

61EC 902026 MOV DPTR,#IE1 ;VECTOR-FOR INT1 IN SCPD.RAM(2026H)



; MOV DPTR,#IE0 ;INT-0 VECTOR INIT. IN SCPD.RAM (2020H)

61EF 1206CD LCALL TERN ;INIT A VECTOR IN SCPD RAM

;i.e. 'JMP ISR1'

61F2 12061D LUP1: LCALL CRLF

61F5 906227 MOV DPTR,#MSG1 ;POINT TO MSG

;"JAIHIND"

61F8 120606 LCALL MSGOUT ;O/P A STRING.

61FB 20B3FD HERE: JB 0B3H,HERE ;WAIT TILL INT1 LINE IS HIGH



100

; JB 0B2H,HERE ;WAIT TILL INT0 LINE HIGH

61FE 75A884 MOV 0A8H,#84H ;ENABLE INT1



; MOV 0A8H,#81H ;ENABLE INT-0

6201 00 NOP

6202 00 NOP ;LET 8031 TAKE

;THE INTERUPT

6203 80ED SJMP LUP1

;NOW GIVE A LOW GOING PULSE TO INT1 ON PIN 15 OF HEADER.

;YOU MAY APPLY THE PULSE BY MOMENTARY SHORTING PIN 2(GND)

;& PIN 15 (INT-1) OF HEADER BY A WIRE.ANY WAY THIS IS A SHORTCUT

;& IF YOU ARE USING INT-0 THEN PIN-1(INT-0) IN PLACE OF PIN-15

;ISR FOR INT1.

6205 75A800 ISR1: MOV 0A8H,#00H ;DISABLE ALL INTS.

6208 30B3FD ISRN: JNB 0B3H,ISRN ;DEBOUNCE..



101

; JNB 0B2H,ISRN ;DEBOUNCE...

620B 78FF MOV R0,#0FFH

620D D8FE DBON: DJNZ R0,DBON ;DELAY DEBOUNCE

620F 30B3F6 JNB 0B3H,ISRN ;CHK STILL..



; JNB 0B2H,ISRN ;CHK STILL..

6212 12061D LCALL CRLF

6215 90622F MOV DPTR,#MSG2

6218 120606 LCALL MSGOUT ;O/P MSG."ANSH 51"

621B 7805 MOV R0,#05H

621D 79FF MOV R1,#0FFH

621F 7AFF MOV R2,#0FFH

6221 120114 MORD: LCALL DELAY ;PASS TIME.

6224 D8FB DJNZ R0,MORD ;MORE DELAY

6226 32 RETI ;RETURN FROM INT.

6227 4A41494849MSG1:DFB "JAIHIND",03H ;MAIN DISPLAY

622F 414E534820MSG2:DFB "ANSH 51",03H ;ISR DISPLAY

102

EXP. NO.13: UART OPERATION IN 8051

AIM: Write ALP Of UART operation in 8051.

APPARATUS: PC,KEIL microvision

PROGRAM:

ORG 00H

MOV TMOD,#20H

MOV TH1,#-3

MOV SCON,#50H

SETB TR1

//AGAIN:

MOV A,#"A"

ACALL TRANS

MOV A,#"N"

ACALL TRANS

MOV A,#"U"

ACALL TRANS

MOV A,#"R"

ACALL TRANS

MOV A,#"A"

ACALL TRANS

MOV A,#"G"

103

ACALL TRANS

MOV A,#"-"

ACALL TRANS

MOV A,#"E"

ACALL TRANS

MOV A,#"C"

ACALL TRANS

MOV A,#"E"

ACALL TRANS

AGAIN:

SJMP AGAIN

TRANS:MOV SBUF,A

HERE:JNB TI,HERE

CLR TI

RET

END

104

OUTPUT:

0000 1 ORG 00H

0000 758920 2 MOV TMOD,#20H

0003 758DFD 3 MOV TH1,#-3

0006 759850 4 MOV SCON,#50H

0009 D28E 5 SETB TR1

000B 7441 7 MOV A,#"A"

000D 1135 8 ACALL TRANS

000F 744E 9 MOV A,#"N"

0011 1135 10 ACALL TRANS

0013 7455 11 MOV A,#"U"


0017 7452 13 MOV A,#"R"


001B 7441 15 MOV A,#"A"


001F 7447 17 MOV A,#"G"


0023 742D 19 MOV A,#"-"


0027 7445 21 MOV A,#"E"


002B 7443 23 MOV A,#"C"


105

002F 7445 25 MOV A,#"E"


0033 27 AGAIN:

0033 80FE 28 SJMP AGAIN

0035 F599 29 TRANS:MOV SBUF,A

0037 3099FD 30 HERE:JNB TI,HERE

003A C299 31 CLR TI

003C 22 32 RET

END

106

EXP.NO.15: INTERFACING LCD TO 8051.

AIM: Interface an LCD with 8051 microcontroller.

APPARATUS:1. 8051 Trainer kit2. LCD module3. FRC cables4. Power Supply.

PROGRAM:

7850 START:7850 7480 MOV A,#80H 7852 90280B MOV DPTR, 7855 F0 MOVX @DPTR, A 7856 7438 MOV A,#38H 7858 127872 LCALL SENDLCDCMD 785B 740C MOV A,#0CH 785D 127872 LCALL SENDLCDCMD 7860 7401 MOV A,#01H 7862 127872 LCALL SENDLCDCMD 7865 7480 MOV A,#80H 7867 127872 LCALL SENDLCDCMD 786A 7441 MOV A,#DISP_CHAR 786C 12788A LCALL SENDLCDDAT 7852 90280B MOV DPTR, 7855 F0 MOVX @DPTR, A 7856 7438 MOV A,#38H 7858 127872 LCALL SENDLCDCMD 785B 740C MOV A,#0CH 785D 127872 LCALL SENDLCDCMD 7860 7401 MOV A,#01H 7862 127872 LCALL SENDLCDCMD 7865 7480 MOV A,#80H 7867 127872 LCALL SENDLCDCMD 786A 7441 MOV A,#DISP_CHAR 786C 12788A LCALL SENDLCDDAT 786F 120006 LCALL 0006H 7872 902809 MOV DPTR, 7875 F0 MOVX @DPTR, A 7876 7408 MOV A,#08H 7878 90280A MOV DPTR,#PORTC_8255 787B F0 MOVX @DPTR, A 787C 7400 MOV A,#00H 787E 90280A MOV DPTR,#PORTC_8255

107

7881 F0 MOVX @DPTR, A 7882 7964 MOV R1,#100D 7884 7A0A MOV R2, #10D 7886 120114 LCALL DELAY 7889 22 RET 788A 902809 MOV DPTR,#LCD_DATABUS 788D F0 MOVX @DPTR, A 788E 7428 MOV A, #28H 7890 90280A MOV DPTR,#PORTC_8255 7893 F0 MOVX @DPTR, A 7894 7420 MOV A, #20H 7896 90280A MOV DPTR,#PORTC_8255 7899 F0 MOVX @DPTR, A 789A 7901 MOV R1, #01D 789C 7A0A MOV R2, #10D 789E 120114 LCALL DELAY 78A1 22 RET

OUT PUT: ‘HELLO WORLD’ will be displayed on the lcd

108

EXP.NO.16: Interfacing Matrix/Keyboard to 8051.

AIM: Interface a Keyboard to 8051 microcontroller.

APPARATUS: 8051 Trainer kit, keyboard module, FRC cables, & Power Supply.

PROGRAM:

UPA55: EQU 280cH

UPB55: EQU UPA55+01H

UPC55: EQU UPB55+01H

UCS55: EQU UPC55+01H

LPA55: EQU 2808H

LPB55: EQU LPA55+01H

LPC55: EQU LPB55+01H

LCS55: EQU LPC55+01H

DTA79: EQU 2810H

CSW79: EQU DTA79+01H

TMR0: EQU 2818H

TMR1: EQU TMR0+01H

TMR2: EQU TMR1+01H

CSW53: EQU TMR2+01H

DTA51: EQU 2828H

CSW51: EQU DTA51+01H

;EQUATES

B: EQU 0F0H

A: EQU 0E0H

DPL: EQU 82H

109

DPH: EQU 83H

TH1: EQU 8DH

TL1: EQU 8BH

R0: EQU 00H ;REFER TO BNK 0 ONLY.

R1: EQU 01H

R2: EQU 02H

R3: EQU 03H

R4: EQU 04H

R5: EQU 05H

R6: EQU 06H

R7: EQU 07H

P2: EQU 0A0H

P3: EQU 0B0H

SP: EQU 81H

SETPT: EQU 2200H

LIMITBD:EQU 2201H

ULB: EQU 2202H

LLB: EQU 2203H

TEMP: EQU 2204H

;MONITER SUBROUTINES EQUATES

CRLF: EQU 061DH

NMOUT: EQU 059EH

TEST: EQU 2000H

WRITE: EQU 2006H

OUTMSG: EQU 0606H

110

DELAY: EQU 0114H

CMDMOD: EQU 0000H

MOVD: EQU 031FH

ORG 7000H

START: MOV SP,#58H ;INIT USER STACK POINTER

MOV A,#82H ;INIT 8255 A-AS O/P B-AS I/P

MOV DPTR,#LCS55

MOVX @DPTR,A

LCALL CRLF ;FEED CR WITH NEW LINE.

MOV DPTR,#20B0H ;SET BASE ADDR OF TRANSITION TABLE.

MOV R4,#20H ;SET HIGHER END ADDR

MOV R3,#0BFH ;SET LOWER END ADDR

MOV A,#0FFH ;DATA TO BE MOVED

LCALL MOVD ;SUBROUTINE FOR DATA MOVE.

MOV DPTR,#20C0H ;SET BASE ADDR OF FINAL TABLE.

MOV R4,#20H ;SET HIGHER END ADDR

MOV R3,#0CFH ;SET LOWER END ADDR

MOV A,#0FFH ;DATA TO BE MOVED

LCALL MOVD ;SUBROUTINE FOR DATA MOVE.

L738A: MOV A,#07H ;SET MAX SCAN LINE

MOV DPTR,#20D0H

MOVX @DPTR,A

MOV A,#00H ;SET CURRENT SCAN LINE

MOV DPTR,#20D1H

MOVX @DPTR,A

111

MOV A,#0FEH

L7396: MOV DPTR,#20D2H ;DECODED INFO OF CURRENT SCAN

MOVX @DPTR,A ;LINE SET SCAN LINE.

MOV DPTR,#LPC55 ;

MOVX @DPTR,A ;

MOV DPTR,#20D1H ;

MOVX A,@DPTR ;

MOV R1,A ;MOV C,A

MOV A,#0B0H ;

ADD A,R1 ;MOVC A,@A+DPTR

MOV DPL,A ;

MOV DPH,#20H ;POINTER TO 20B0+

MOVX A,@DPTR ;MOV A,M

MOV R2,A ;MOV B,M

PUSH DPL

PUSH DPH

MOV DPTR,#LPB55 ;GET PRESENT KEY ENTRIES

MOVX A,@DPTR

ORL A,#0FCH ;DESABLE UNUSED RETURN LINES

POP DPH

POP DPL

MOVX @DPTR,A ;

ORL A,R2

MOV R7,A ;STORE ACC

112

MOV A,R1

MOV A,#0C0H ;GET THE CONTENTS FROM FINAL

ADD A,R1 ;MOVC A,@A+DPTR,TABLE & SAVE NEW FOR N-KEY ROLLOVER.

MOV DPL,A

MOV DPH,#20H

MOVX A,@DPTR

MOV R1,A ;

MOV A,R7 ;

MOVX @DPTR,A

CPL A ;COMPLIMENT TO FIND DEBOUNCED KEY ENTRY INDICATED BY

ANL A,R1 ;0 BIT IN CURRENT SCAN LINE.

CPL A

CJNE A,0FFH,YESKEY ;IF ACC=FF NO KEY PRESSED.

L73F8: PUSH R1

PUSH R2

MOV R1,#01H ;DEBOUNCE DELAY IS SET IN

MOV R2,#00H

LCALL DELAY ;

POP R2

POP R1

LCALL TEST ;CHECK KBD ONCE FOR KEY PRESSED

JNC L740A ;JUMP TO GET MAX SCAN LINE IF NO KEYPRESSED

CJNE A,#1BH,L740A

LJMP CMDMOD ;IF "ESC" PRESSED GOTO COMMAND MODE

113

L740A: MOV DPTR,#20D0H ;GET MAX SCAN LINE LIMIT

MOVX A,@DPTR

MOV R1,A

MOV DPTR,#20D1H ;GET CURRENT SCAN LINE LIMIT

MOVX A,@DPTR

CLR C

PUSH A

SUBB A,R1

POP A

JNC L738A ;JUMP TO RESET DDLOC & SCAN LINE

INC A ;ELSE SET FOR NEXT SCAN LINE

MOV DPTR,#20D1H

MOVX @DPTR,A

MOV DPTR,#20D2H

MOVX A,@DPTR

RLC A

LJMP L7396

YESKEY:

MOV R1,A ;CORRESPONDING ASCII CODE.

MOV DPTR,#20D1H ;LOAD CURRENT SCAN LINE LIMIT.

MOVX A,@DPTR

INC A ;INCREMENT THE SCAN LINE NO

MOV R2,A

MOV DPTR,#L7420 ;POINTER TO KEYLIST TO DISPLAY

L73C6: MOVX A,@DPTR ;GET SCAN LINE NO FROM TABLE

114

CJNE A,R2,L73CB

L73E1: INC DPTR

MOVX A,@DPTR ;GET NEXT KEY CODE

INC A

CJNE A,#00H,LOOP3 ;JZ L73F8,END OF PRESENT KEY BUNCH

LJMP L73F8

LOOP3: MOV A,R1

RRC A ;IF CARRY=1 INVALID KEY

MOV R1,A

JC L73E1 ;JMP TO CHK NEXT KEY IF CY=1,ELSE FETCH ASCII CODE

MOVX A,@DPTR

CJNE A,#00H,LOOP1 ;IS KEY IS VALID

LJMP DSPLY ;JUMP TO DISPLAY "?" FOR INVALID KEY DETECTION.

LOOP1: LCALL WRITE ;ELSE DISPLAY ASCII CODE FOR CURRENT KEYCLOSURE.

LJMP L73E1 ;CHECK FOR NEXT KEY CLOSURE.

L73CB: INC DPTR

MOVX A,@DPTR ;GET SCAN LINE NO. FROM NEXT SCAN LINE ENTRY.

INC A

CJNE A,#00H,L73CB

INC DPTR

MOVX A,@DPTR

CJNE A,0FFH,L73C6 ;IS IT END OF KEY LIST,IF NOT GO FOR NEXT

DSPLY: MOV A,#"?" ;ELSE DISPLAY "?" FOR INVALID KEY ENTRY

LCALL WRITE

LJMP L73F8

115

DSPLY1: MOV A,#30H ;ELSE DISPLAY "?" FOR INVALID KEY ENTRY

LCALL WRITE

LJMP DSPLY1

L7420: DFB 01H ;SCAN LINE NO.1

DFB 30H ;R0 FIRST RETURN LINE "0"

DFB 38H ;R1 SECOND RETURN LINE "8"

DFB 32H

DFB 0FFH ;END OF KEYS IN SCAN 1

DFB 02H ;

DFB 31H ;RETURN LINE "1"

DFB 39H ;RETURN LINE "9"


DFB 03H

DFB 32H ;ASCII OF "2"

DFB 41H ;ASCII OF "A"


DFB 04H


DFB 42H ;ASCII OF "B"


DFB 05H


DFB 43H ;ASCII OF "C"


DFB 06H

116


DFB 44H ;ASCII OF "D"


DFB 07H


DFB 45H ;ASCII OF "E"


DFB 08H


DFB 46H ;ASCII OF "F"


DFB 0FFH

END

117

OUTPUT:

280C = UPA55: EQU 280cH

280D = UPB55: EQU UPA55+01H

280E = UPC55: EQU UPB55+01H

280F = UCS55: EQU UPC55+01H

2808 = LPA55: EQU 2808H

2809 = LPB55: EQU LPA55+01H

280A = LPC55: EQU LPB55+01H

280B = LCS55: EQU LPC55+01H

2810 = DTA79: EQU 2810H

2811 = CSW79: EQU DTA79+01H

2818 = TMR0: EQU 2818H

2819 = TMR1: EQU TMR0+01H

281A = TMR2: EQU TMR1+01H

281B = CSW53: EQU TMR2+01H

2828 = DTA51: EQU 2828H

2829 = CSW51: EQU DTA51+01H

;EQUATES

00F0 = B: EQU 0F0H

00E0 = A: EQU 0E0H

0082 = DPL: EQU 82H

0083 = DPH: EQU 83H

008D = TH1: EQU 8DH

008B = TL1: EQU 8BH

0000 = R0: EQU 00H ;REFER TO BNK0 ONLY.

118

0001 = R1: EQU 01H

0002 = R2: EQU 02H

0003 = R3: EQU 03H

0004 = R4: EQU 04H

0005 = R5: EQU 05H

0006 = R6: EQU 06H

0007 = R7: EQU 07H

00A0 = P2: EQU 0A0H

00B0 = P3: EQU 0B0H

0081 = SP: EQU 81H

2200 = SETPT: EQU 2200H

2201 = LIMITBD:EQU 2201H

2202 = ULB: EQU 2202H

2203 = LLB: EQU 2203H

2204 = TEMP: EQU 2204H

;MONITER SUBROUTINES EQUATES

061D = CRLF: EQU 061DH

059E = NMOUT: EQU 059EH

2000 = TEST: EQU 2000H

2006 = WRITE: EQU 2006H

0606 = OUTMSG: EQU 0606H

0114 = DELAY: EQU 0114H

0000 = CMDMOD: EQU 0000H

031F = MOVD: EQU 031FH

119

7000 758158 START: MOV SP,#58H ;INIT USER STACK POINTER

7003 7482 MOV A,#82H ;INIT 8255 A-AS O/P B-AS I/P

7005 90280B MOV DPTR,#LCS55

7008 F0 MOVX @DPTR,A

7009 12061D LCALL CRLF ;FEED CR WITH NEW LINE.

700C 9020B0 MOV DPTR,#20B0H

ANURAG COLLEGE OF ENGINEERING · Program for digital clock design using 8086. 6. Interfacing ADC...

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Transcript of ANURAG COLLEGE OF ENGINEERING · Program for digital clock design using 8086. 6. Interfacing ADC...