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How to Interface DAC 0800 with 8086 Lab Trainer Kit

8086 trainer board

PS-TRAINER-8086A microprocessor trainer kit is proposed to smooth the progress of learning and developing designs of microprocessor from Intel. It has the facility to connect PC’s 101/104 Keyboard, to enter user programs in Assembly languages. User verifies the programs through LCD or PC. User friendly Firmware confirms facilitating the beginners learns operations of a microprocessor quickly.

DAC 0800

Fig 1 shows DAC0800 series are monolithic 8-bit high-speed current output digital-to-analog converters (DAC) featuring typical settling times of 100 ns.. The noise immune inputs will accept variety of logic levels. The performance and characteristics of the device are essentially unchanged over the ±4.5V to ±18V power supply range and power consumption at only 33 mW with ±5V supplies is independent of logic input levels.



Fig 1: pin diagram of DAC 0800



How a DAC works



INTERFACING DAC WITH 8086

We now want to we now want to convert the Digital signal to analog voltage by using 8086 trainer board. Here we are using DAC 0800. The DAC 0800 consists of a 8 data lines and REF voltage lines. When the DAC is given the digital input it converts the Digital data to corresponding current , to convert the I to V we use UA 741.

PIN ASSIGNMENT WITH PIN ASSIGNMENT WITH 8086



 

8086

DAC 0800

DAC 0800 PIN DIAGRAM

REF VOLTAGE LINES

V+ Line is given to +12V regulator(7812)

V- Line is given to -12V regulator(7912)

78 series in the Regulator IC indicates + voltage

79 series in the Regulator IC indicates - voltage

DAC – DATA LINES

PA.0

D0

PA.1

D1

PA.2

D2

PA.3

D3

PA.4

D4

PA.5

D5

PA.6

D6

PA.7

D7

VCC

40

16

Supply drawn from MCU/MPU/

GND

20

3

 



CIRCUIT DIAGRAM TO INTERFACE DAC 0800 WITH 8086





ASSEMBLY PROGRAM TO INTERFACE DAC0800 WITH 8086

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Title : To Create a Saw Tooth Wave

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MEMORY ADDRESS

OPCODE

MNEMONICS

1100      

B0 80     

               MOV AL, 80H

1102      

BA 36 FF

               MOV DX,FF36

1105

EE

               OUT DX, AL

1106      

B0 00     

START: MOV AL,00

1108      

BA 30 FF

               MOV DX, FF30

110B      

EE

LOOP1 :OUT DX,AL

110C      

FE C0

               INC AL

110E

75 FB     

                JNZ LOOP1

1110      

EB F4     

                JMP START