EC7412: MICROCONTROLLER AND INTERFACING LABORATORY of 8086 Microprocessor.pdfMOV DX,FF26H //Load DX...

EC7412: MICROCONTROLLER AND INTERFACING LABORATORY

Dr. V. SATHIESH KUMAR Department of Electronics Engineering, MIT 1

Presentation Slides:

www.sathieshkumar.com/tutorials

Presented By,

Dr. V. Sathiesh Kumar Department of Electronics Engg.,

MIT-Anna University

Overview 1. Basic assembly language program using 8086 2. 8255-Programmable peripheral interface 3. Stepper Motor Interfacing 4. Traffic Light Control System 5. DAC Interface using DAC0808 6. ADC Interface using ADC0804

EC7412: MICROCONTROLLER INTERFACING LABORATORY 8086

2

Dr. V. SATHIESH KUMAR Department of Electronics Engineering, MIT

8086 Architecture:


3


8086 Pin Details:


4


Procedure to enter a program

1. Switch on the 8086 kit, Type A and enter.

2. Type in the starting address and press enter. Example: A8000

3. Enter the mnemonics.

Procedure to input data or view the output data

1. Type M input/output address and press enter key. Example: M8150

2. Update the locations with desired bytes.

Procedure to execute the program

1. Press reset key.

2. Type G starting address of code and press enter key. Example: G8000

3. Press RES Key

4. Check the output data after execution of the program.

Key Functions

RES (RESET) : This key allows the user to terminate any activity and return to an

initialized state.

Procedure to view the program

1. Type U starting address of code and press enter key. Example: U8000

2. To view next instruction, press Space Bar


5

8086 Programming: Addition of two 16-bit numbers

# BEGIN 1000H

MOV AX,1212

MOV BX,1212

ADD AX,BX

MOV SI,1200

MOV [SI],AX

HLT //Program End

// ANSWER-> 1200 = 24H, 1201 = 24H

# BEGIN 1000H

MOV SI,1200

LODSW

MOV BX,AX

LODSW

ADD BX,AX

MOV DI,1300

MOV [DI],BX

HLT // Program End

//INPUT-> 1200=13H, 1201=13H, 1202=14H, 1203=14H ANSWER-> 1300=27H, 1301=27H


6

8086 Programming: Subtraction of two 16-bit numbers

# BEGIN 1000H

MOV SI,1200

LODSW

MOV BX,AX

LODSW

SUB BX,AX

MOV DI,1300

MOV [DI],BX

HLT // Program End




7

8086 Programming: Multiplication of two 16-bit numbers

# BEGIN 1000H

MOV SI,1200

LODSW

MOV BX,AX

LODSW

MUL BX

MOV DI,1300

MOV [DI],AX

INC DI

INC DI

MOV [DI],DX

HLT // Program End




8

8086 Programming: Division of two 16-bit numbers

# BEGIN 1000H

MOV DX,0000

MOV AX,0006

MOV CX,0002

DIV CX

MOV DI,1300

MOV [DI],AL

INC DI

MOV [DI],AH

INC DI

MOV [DI],DX

HLT // Program End

//INPUT-> AX=0006H, CX=0002H ANSWER-> 1300=03H, 1301=00H, 1302=00H (REMAINDER)



9

8086 Programming: Largest no in an array

# BEGIN 1000H

MOV SI,1200

MOV CL,[SI]

INC SI

MOV AL,[SI]

DEC CL

LOOP: INC SI

CMP AL,[SI]

JNB LOOP1

MOV AL,[SI]

LOOP1: DEC CL

JNZ LOOP

MOV DI,1300

MOV [DI],AL

HLT // Program End

//INPUT-> 1200=06H (COUNT), 1201=02H, 1202=AAH, 1203=F0H, 1204=89H, 1205=F4H, 1206=0AH

//ANSWER-> 1300=F4H



10

8086 Programming: Smallest no in an array

# BEGIN 1000H

MOV SI,1200

MOV CL,[SI]

INC SI

MOV AL,[SI]

DEC CL

LOOP: INC SI

CMP AL,[SI]

JB LOOP1

MOV AL,[SI]

LOOP1: DEC CL

JNZ LOOP

MOV DI,1300

MOV [DI],AL

HLT // Program End

//INPUT-> 1200=06H (COUNT), 1201=02H, 1202=AAH, 1203=F0H, 1204=89H, 1205=F4H, 1206=0AH

//ANSWER-> 1300=02H



11

8086 Programming: Fibonacci Series

# BEGIN 1000H

MOV CL,10

MOV BL,00

MOV DL,01

MOV DI,1300

MOV AL,DL

LOOP: ADD AL,BL

MOV [DI],AL

INC DI

MOV BL,DL

MOV DL,AL

DEC CL

JNZ LOOP

HLT // Program End



12

8086 Programming: Factorial of a number

# BEGIN 1000H

MOV CL,04

MOV AL,01

MOV BL,01

LOOP: MUL BL

INC BL

DEC CL

JNZ LOOP

MOV DI,1300

MOV [DI],AX

HLT // Program End

// ANSWER-> 1300=18H



13

8086 Programming: Ascending order

# BEGIN 1000H

MOV DX,[5000]

LOOP3: MOV CX,DX

MOV SI,5002

LOOP2: MOV AX,[SI]

CMP AX,[SI+02]

JL LOOP1

XCHG [SI+02],AX

XCHG [SI],AX

LOOP1: ADD SI,0002

LOOP LOOP2

DEC DX

JNZ LOOP3

INT 3 // BREAKPOINT



14

8086 Programming: Descending order

# BEGIN 1000H

MOV DX,[5000]

LOOP3: MOV CX,DX

MOV SI,5002

LOOP2: MOV AX,[SI]

CMP AX,[SI+02]

JGE LOOP1

XCHG [SI+02],AX

XCHG [SI],AX

LOOP1: ADD SI,0002

LOOP LOOP2

DEC DX

JNZ LOOP3

INT 3 // BREAKPOINT



15

8086 Programming: Matrix Addition

# BEGIN 1000H

MOV CL,09

MOV SI,1200

MOV DI,1300

LOOP: MOV AL,[SI]

MOV BL,[DI]

ADD AL,BL

MOV [DI],AL

INC DI

INC SI

DEC CL

JNZ LOOP

HLT

//INPUT: 1200 02H, 02H, 02H 1300 02H, 02H, 02H OUTPUT

1203 03H, 03H, 03H 1303 03H, 03H, 03H 1300 04H,04H,04H

1206 04H, 04H, 04H 1306 04H, 04H, 04H 1303 06H,06H,06H

1306 08H,08H,08H



16

8255 Programmable peripheral interface (PPI):

1. Is used to give the CPU access to programmable parallel I/O

2. 24 Input/Output pins (PORTA, PORTB, PORTC) in all

3. D0-D7 data bus lines are available to read/write data into the ports or control register

using RD and WR.

4. Address lines A1 and A0 allow to successively access any one of the ports or the

control register.

5. CS is used to enable 8255 chip

6. On Reset, all the ports are initialized as input line

A1 A0 PORT SELECTED

0 0 PORTA

0 1 PORTB

1 0 PORTC

1 1 Control Register



17

Modes of 8255 Programmable peripheral interface (PPI):



18

Bit set/reset mode (BSR Mode):

1. Applicable only to PORTC



19

Input/Output mode (I/O Mode):



20

8255 Pin Details:



21

Stepper Motor Interfacing:

EC7412: MICROCONTROLLER AND INTERFACING LABORATORY 8086

• Applications: Disk drives, Dot matrix printers and in robotics

• Step angle: Minimum degree of rotation associated with a single step

• 8086 Address for 8255 Interface

A

B

A

B

Control Word (Clockwise)

0 1 1 1 0x07

1 0 1 1 0x0B

1 1 0 1 0x0D

1 1 1 0 0x0E

+12 V

A

A

B

B

Socket Connections

Control word register 0xFF26

PORTA 0xFF20

PORTB 0xFF22

PORTC 0xFF24


22



A

B

A

B

Control Word (Clockwise)

0 0 1 1 0x03

1 0 0 1 0x09

1 1 0 0 0x0C

0 1 1 0 0x06

A and B are generated using NOT gate

PA2 is for supply to the coil or motor

PA2

PA1

A

PA0

B

Control Word

(Clockwise)

1 0 0 0x04

1 0 1 0x05

1 1 1 0x07

1 1 0 0x06


23



MOV DX,FF26H //Load DX with the address of control register

MOV AL,80H //Enable I/O mode

OUT DX,AL

START: MOV DX,FF20H //Move the address of PORTA to DX

MOV AL,05H //Start the clockwise rotation sequence

OUT DX,AL

CALL DELAY

MOV AL,07H

OUT DX,AL

CALL DELAY

MOV AL,06H

OUT DX,AL

CALL DELAY

MOV AL,04H

OUT DX,AL

CALL DELAY

JMP START


24



DELAY SUBROUTINE:

MOV BX,0010H

L2: MOV AL,FFH

L1: NOP

NOP

NOP

NOP

DEC AL

JNZ L1

DEC BX

JNZ L2

RET


25



MOV DX,FF26H //Load DX with the address of control register

MOV AL,80H //Enable I/O mode

OUT DX,AL

START: MOV DX,FF20H //Move the address of PORTA to DX

MOV AL,04H //Start the anti-clockwise rotation sequence

OUT DX,AL

CALL DELAY

MOV AL,06H

OUT DX,AL

CALL DELAY

MOV AL,07H

OUT DX,AL

CALL DELAY

MOV AL,05H

OUT DX,AL

CALL DELAY

JMP START


26



DELAY SUBROUTINE:

MOV BX,0010H

L2: MOV AL,FFH

L1: NOP

NOP

NOP

NOP

DEC AL

JNZ L1

DEC BX

JNZ L2

RET


27

Traffic Light Control System:


EG1 EG2 EG3

EY

ER

WR

WY

WG1 WG2 WG3

SR

SY

SG

1

SG

2

SG

3

NG

1

NG

2

NG

3

NY

NR

EAST

WEST

NORTH SOUTH

R1B

P2B

R1B

P2B

R2C P1C

P1C R2C

P2A

R1A

P2A

R1A

R2D P1D

R2D P1D


28



P1D P2A P1C P2B R2C R1A R2D R1B

PEDESTRIAN CONTROL LED-PORTB (Address:0x21H)

B0 B7

0- LED OFF

1- LED ON

X- Don’t Care (0 or 1)

NR &SR

ER & WR

EY & WY

NY & SY

NG3 &SG1

NG2 & SG2

EG2 & WG2

EG3 & WG1

A0 A7

TRAFFIC CONTROL LED-PORTA (Address:0x20H)

TRAFFIC CONTROL LED-PORTC(Address:0x22H)

X X X X X X SG3 & NG1

EG1 & WG3

C0 C7


29



R R

P

P

R R

R R

R R

R R

R R

P

P

R

R

R

R

R

R

R

R

R R

R R

R

R

R

R

R R

R R

R

R

R

R

P P

P P

R

R

R

R

1 2 3

4 5 6


30



MOV AL,80H //I/O Mode

MOV DX,FF26H // Load DX with address of control word register

OUT DX,AL // Control word register=0xFF26

LOOP: MOV AL,0FH // For pedestrian

MOV DX,FF22H

OUT DX,AL

MOV AL,4DH // For green leds in N-S direction

MOV DX,FF20H

OUT DX,AL

CALL DELAY // Sequence delay

CALL AMBER // Amber delay

MOV AL,8BH // For stopping N-S direction & starting in E-W direction

MOV DX,FF20H

OUT DX,AL

CALL DELAY

CALL AMBER


31



MOV AL,49H // For free left in all sides & stopping E-W direction

MOV DX,FF20H

OUT DX,AL

MOV AL,01H // For right turn in N-S direction

MOV DX,FF24H

OUT DX,AL

CALL DELAY

MOV AL,00H // For Amber signal

MOV DX,FF24H

OUT DX,AL

CALL AMBER

MOV AL,89H // For stopping vechicles in N-S direction

MOV DX,FF20H

OUT DX,AL

MOV AL,02H // For right turn in E-W direction

MOV DX,FF24H

OUT DX,AL

CALL DELAY


32



MOV AL,00H

MOV DX,FF24H

OUT DX,AL

MOV AL,30H

MOV DX,FF20H

OUT DX,AL

MVI CL,04H

CALL DELAYSUB // For Amber delay

MOV AL,C0H // For stopping vehicles in all direction

MOV DX,FF20H

OUT DX,AL

MOV AL, F0H // Green signal for pedestrian

MOV DX,FF22H

OUT DX,AL

MVI CL,10H

CALL DELAYSUB


33



MOV AL,30H

MOV DX,FF20H

OUT DX,AL

MOV CL,08H

CALL DELAYSUB

JMP LOOP


34



AMBER SUBROUTINE:

MOV AL,39H // For amber signal in all directions

MOV DX,FF20H

OUT DX,AL

MOV CL,08H

CALL DELAYSUB

RET

DELAY SUBROUTINE:

MOV CL,40H

CALL DELAYSUB

RET


35



DELAYSUB SUBROUTINE:

L3: MOV BL,FFH

L2: MOV AL,FFH

L1: NOP

DCR AL

JNZ L1

DCR BL

JNZ L2

MOV AL,CL

JZ OUT

DCR CL

JNZ L3

OUT: RET


36

DAC Interface:


DAC 0808 is a 8-bit DAC

Binary weighted DAC and R/2R ladder type

DAC0808 (8-bit) provides 256 discrete voltage or current levels of output

7 6 5 3 04 2 1( )2 4 8 16 32 64 128 256

out ref

D D D D DD D DI I

2refI mA


37

DAC Interface:



38

DAC Interface:


SQUARE WAVEFORM GENERATION

MOV AL,80H // I/O mode

MOV DX,FF26H // Load DX with control word register address

OUT DX,AL

START: MOV AL,FFH // Logic high level

MOV DX,FF20H // Load DX with PORTA address

OUT DX,AL

CALL DELAY

MOV AL,00H // Logic low level

OUT DX,AL

CALL DELAY

JMP START


39

DAC Interface:


SQUARE WAVEFORM GENERATION

DELAY SUBROUTINE:

MOV BL,05H

L1: MOV CL,FFH

L2: DEC CL

JNZ L2

DEC BL

JNZ L1

RET


40

DAC Interface:


SAWTOOTH WAVEFORM GENERATION

MOV AL,80H // I/O mode

MOV DX,FF26H // Load DX with control word register address

OUT DX,AL

START: MOV AL,00H // Initialize AL register

MOV DX,FF20H // Load DX with PORTA address

L1: OUT DX,AL

INC AL

JNZ L1

JMP START


41

ADC Interface:


1 1606

1.1 1.1 10 150

11.65

f kHzRC k pF

t sf


42

ADC Interface:


Vref/2 (V) Vin (V) Step Size (mV)

Not connected 0 to 5 5/256=19.53

2.0 0 to 4 4/256=15.62

1.5 0 to 3 3/256=11.71

1.28 0 to 2.56 2.56/256=10

When Vref/2 is not connected (open), Vref/2 is measured at 2.5 V for Vcc=5V

Step Size (Resolution) is the smallest change that can be discerned by an ADC


43

ADC Interface:


MOV DX,FF26H // Load DX with the address of control register

MOV AL,90H // CWR for PORTA as Input , PORTB & C as Output

OUT DX,AL

MOV DX,FF24H // PORTC is enabled for WR

MOV AL,FFH

OUT DX,AL

MOV AL,00H // WR must be a low to high transition

OUT DX,AL

MOV AL,FFH

OUT DX,AL

CALL DELAY // Delay routine

MOV DX,FF20H //Load DX with the address of PORTA

IN AL,DX // Read the ADC value from PORTA

INT 3 // Breakpoint


44

ADC Interface:


DELAY SUBROUTINE:

MOV CX,FFFFH

L1: NOP

NOP

DEC CX

JNE L1

RET


45

Summary:


Architecture and pin details of 8086 microprocessor

Basic assembly language programming using 8086 microprocessor

Architecture and pin details of 8255

Stepper motor interfacing

Traffic light control system

DAC interface using DAC0808

ADC interface using ADC0804


Date post:	16-Mar-2020
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EC7412: MICROCONTROLLER AND INTERFACING LABORATORY of 8086 Microprocessor.pdfMOV DX,FF26H //Load DX...

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