Interfacing Dac 0800 With 8051trainer 3gh68

8051 HOW-TO GUIDE

Interfacing DAC 0800 with 8051

Contents at a Glance 8051TRAINER KIT .............................................................3 DAC 0800.........................................................................3 INTERFACING DAC WITH 8051..........................................5 PIN ASSIGNMENT WITH PIN ASSIGNMENT WITH 8051 .....5 CIRCUIT DIAGRAM TO INTERFACE DAC 0800 WITH 8051 ...6 ASSEMBLY PROGRAM TO INTERFACE DAC 0800 WITH 80517

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8051TRAINER KIT PS-TRAINER-8051 trainer kit is proposed to smooth the progress of learning and developing designs of MCU from Intel and NXP. It has the facility to connect PC’s 101/104 Keyboard, to enter programs in Assembly languages. Serial communication achieved using 8051. It also s C & assembly language in standalone kit (P89V51RD2). It’s designed as to facilitate On-board Programmer for NXP 8051 MCU through ISP on serial port. 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

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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

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INTERFACING DAC WITH 8051 We now want to we now want to convert the Digital signal to analog voltage by using PS/2 8051 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 8051

REF VOLTAGE LINES

8051

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 8051

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ASSEMBLY PROGRAM TO INTERFACE DAC 0800 WITH 8051 CNTRL: 4003H PORTA : 4000CH

MEMORY ADDRESS

OPCODE

MNEMONICS

8500

74 80

MOV A, #80H

8502

90 FF 0F

MOV DPTR, #CNTRL

8505

F0

MOVX @DPTR, A

8506

74 00

START: MOV A, #00H

8508

90 FF 0C

L1: MOV DPTR, #PORTA

850B

F0

MOVX @DPTR, A

850C

04

INC A

850D

70 F9

CJNE A, #0FF, L1

850F

80 F5

SJMP START

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