Rainbow-electronics ADC0848 Uživatelský manuál stáhnout pdf (Strana 15)

Applications Information (Continued)

ADC0844ÐINS8039 Interface

TL/H/5016–27

SAMPLE PROGRAM FOR ADC0844ÐINS8039 INTERFACE

CONVERTING TWO RATIOMETRIC, DIFFERENTIAL SIGNALS

ORG 0H

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 18 INC R0 ;INCREMENT THE A/D DATA ADDRESS

001D 14 50 CALL CONV ;CALL THE CONVERSION SUBROUTINE

;CONTINUE MAIN PROGRAM

;CONVERSION SUBROUTINE

;ENTRY:ACCÐA/D MUX DATA

;EXIT: ACCÐCONVERTED DATA

ORG 50H

0050 99 FE CONV: ANL P1,

0FEH ;CHIP SELECT THE A/D

0052 91 MOVX

R1,A ;LOAD A/D MUX & START CONVERSION

0053 09 LOOP: IN A,P1 ;INPUT INTR

STATE

0054 32 53 JB1 LOOP ;IF INTR

1 GOTO LOOP

0056 81 MOVX A,

R1 ;IF INTR

0 INPUT A/D DATA

0057 89 01 ORL P1,&01H ;CLEAR THE A/D CHIP SELECT

0059 A0 MOV

R0,A ;STORE THE A/D DATA

005A 83 RET ;RETURN TO MAIN PROGRAM

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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