ADC0844 datasheet(16/20 Pages) NSC

Part #	ADC0844

Description	8-Bit uP Compatible A/D Converters with Multiplexer Options

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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16 / 20 page

Applications Information (Continued)

SAMPLE PROGRAM FOR ADC0844 — INS8039 INTERFACE

CONVERTING TWO RATIOMETRIC, DIFFERENTIAL SIGNALS

ORG

0000

04 10

JMP

BEGIN

;START PROGRAM AT ADDR 10

ORG

10H

;MAIN PROGRAM

0010

B9 FF

BEGIN:

MOV

R1,#0FFH

;LOAD R1 WITH A UNUSED ADDR

;LOCATION

0012

B8 20

MOV

R0,#20H

;A/D DATA ADDRESS

0014

89 FF

ORL

P1,#0FFH

;SET PORT 1 OUTPUTS HIGH

0016

23 00

MOV

A,00H

;LOAD THE ACC WITH A/D MUX DATA

;CH1 AND CH2 DIFFERENTIAL

0018

14 50

CALL

CONV

;CALL THE CONVERSION SUBROUTINE

001A

23 02

MOV

A,#02H

;LOAD THE ACC WITH A/D MUX DATA

;CH3 AND CH4 DIFFERENTIAL

001C

INC

;INCREMENT THE A/D DATA ADDRESS

001D

14 50

CALL

CONV

;CALL THE CONVERSION SUBROUTINE

;CONTINUE MAIN PROGRAM

;CONVERSION SUBROUTINE

;ENTRY:ACC — A/D MUX DATA

;EXIT: ACC — CONVERTED DATA

ORG

50H

0050

99 FE

CONV:

ANL

P1,#0FEH

;CHIP SELECT THE A/D

0052

MOVX

@R1,A

;LOAD A/D MUX & START CONVERSION

0053

LOOP:

A,P1

;INPUT INTR STATE

ADC0844 — INS8039 Interface

DS005016-27

ADC0844 Datasheet(PDF) 16 Page - National Semiconductor (TI)

ADC0844 Datasheet(HTML) 16 Page - National Semiconductor (TI)

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