HARDWARE INTERFACING

DAC Interfacing with 8086 :

 

Digital to Analog Converter Which can convert Discrete Continuous  signal in to Analog signal.

As shown in below the DAC IC :

  

fig.IC DAC 0808

 

DAC has reference voltage, this voltage is compare with input voltage according to that voltage it can generate analog signal.

In DAC we a

apply digital signal in the form of Program And then Processor process on digital signal and apply to DAC kit.

Hardware connection of DAC interfacing:

-Connect Processor and DAC kit with the help of RFC cable .

- Output of DAC is connected to CRO(Cathode Ray Oscilloscope ) with the help of probes .

-Then type on terminal minicom -s -c on

-select serial setup and fix baud rate with the help of INC/DEC button on kit .

-Type code in minicom  and run it by using G (address location ) and enter it.

How it convert Digital to Analog ??????????? 

As shown in below the practical wave on DSO(Digital Storage Oscilloscope)

fig.Practical Wave form

ALGORITHM:

i) Start.

ii) control word.

iii) Send HIGH value (5v) to output PORT call delay.

iv) Send LOW value (0v) to output PORT call delay.

iv) GO to step iii.

v) STOP. 

PROGRAM :

A 1000

0000:1000  MOV AL, 89

0000:1002  OUT 67, AL

0000:1004  MOV AL, 01

0000:1006  OUT 63, AL

0000:1008  MOV CL, FF

0000:100A  MOV AL, FF

0000:100C  OUT 61, AL

0000:100E  DEC CL

0000:1010  JNZ 100C

0000:1012  MOV CL, FF

0000:1014  MOV AL, 00

0000:1016  OUT 61, AL

0000:1018  DEC CL

0000:101A  JNZ 1016

0000:101C  JMP 1008

0000:101E  INT 3











 

 OUTPUT WAVEFORM OF SQUARE WAVE :

fig.Program of Square wave

    as shown in below wave form of square wave

fig.Square wave form on CRO

 

STAIRCASE WAVE FORM:

PROGRAM:

0000:1000  MOV AL, 89

0000:1002  OUT 67, AL

0000:1004  MOV AL, 01

0000:1006  OUT 63, AL

0000:1008  MOV CL, FF

0000:100A  MOV AL, 00

0000:100C  OUT 61, AL

0000:100E  DEC CL

0000:1010  JNZ 100C

0000:1012  MOV CL, FF

0000:1014  MOV AL, 55

0000:1016  OUT 61, AL

0000:1018  DEC CL

0000:101A  JNZ 1016

0000:101C  MOV CL, FF

0000:101E  MOV AL, AA

0000:1020  OUT 61, AL

0000:1022  DEC CL

0000:1024  JNZ 1020

0000:1026  MOV CL, FF

0000:1028  MOV AL, FF

0000:102A  OUT 61, AL

0000:102C  DEC CL

0000:102E  JNZ 102A

0000:1030  MOV CL, FF

0000:1032  MOV AL, AA

0000:1034  OUT 61, AL

0000:1036  DEC CL

0000:1038  JNZ 1034

0000:103A  MOV CL, FF

0000:103C  MOV AL, 55

0000:103E  OUT 61, AL

0000:1040  DEC CL

0000:1042  JNZ 103E

0000:1044  JMP 1008
WAVEFORM:

fig.Staircase waveform on CRO