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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 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.



pin diagram of DAC 0800

Fig 1: pin diagram of DAC 0800


How a DAC works

How a DAC works

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



 

8085

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


How a DAC works  How a DAC works  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

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 8085



CIRCUIT DIAGRAM TO INTERFACE DAC 0800 WITH 8085

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