Download Interfacing DAC 0800 with 8085

8085 HOW-TO GUIDE
Interfacing DAC 0800
with 8085
Contents at a Glance
8085TRAINER KIT .............................................................3
DAC 0800.........................................................................3
INTERFACING DAC WITH 8085..........................................5
PIN ASSIGNMENT WITH PIN ASSIGNMENT WITH 8085 .....5
CIRCUIT DIAGRAM TO INTERFACE DAC 0800 WITH 8085 ...6
ASSEMBLY PROGRAM TO INTERFACE DAC0800 WITH 80857
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8085TRAINER KIT
PS-TRAINER-8085
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 highspeed 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.
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Fig 1: pin diagram of DAC 0800
How a DAC works
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INTERFACING DAC WITH 8085
We now want to we now want to convert the Digital
signal to analog voltage by using 8085 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 8085
REF VOLTAGE LINES
8085
DAC 0800
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
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
GND
20
3
DAC – DATA LINES
DAC 0800 PIN DIAGRAM
Supply drawn from MCU/MPU/
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CIRCUIT DIAGRAM TO INTERFACE DAC 0800 WITH 8085
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ASSEMBLY PROGRAM TO INTERFACE DAC0800 WITH 8085
***************************************************************************************
Title : TO CREATE A SAW-TOOTH WAVE AT THE OUTPUT OF DAC 0800
***************************************************************************************
CNTL: 23
PORT A: 20
MEMORY ADDRESS
OPCODE
MNEMONICS
9100
3E 80
MVI A,80
9102
D3 23
OUT CNTRL
9104
3E 00
START:
MVI A, 00
9106
D3 20
LOOP1:
OUT PORTA
9108
3C
INR A
9109
C2 06 91
JNZ LOOP1
910C
C3 04 91
JMP START
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