NuDAQ PET-48DIO, Руководство пользователя, Страница: 30 / 38

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Control Programming
To write the port
MOV DX , INDEX ; DATA OF INDEX SAME AS I /O
; ADDRESS THAT SET BY SW1
MOV AL , CTRL0 ; CTRL0 = 3H
OUT DX , AL ; SET INDEX TO GROUP 0
; CONTROL WORD
JMP $+2 ; DELAY
MOV DX , DATA ; DATA = INDEX + 1
MOV AL , MOD0 ; 8255 MODE 0 = 0
OUT DX , AL ; WRITE MOD0 TO CTRL0
JMP $+2 ; DELAY
DEC DX ; POINT TO INDEX ADDRESS
MOV AL , PA0 ; PA0 = 0
OUT DX , AL ; INDEX TO PA0
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
MOV AL , 55H ;
OUT DX , AL ; WRITE 55H TO PA0
JMP $+2
DEC DX ;
To access the port
MOV DX , INDEX ; DATA OF INDEX SAME AS I/O
; ADDRESS THAT SET BY SW1
MOV AL , CTRL1 ; CTRL1= 7H
OUT DX , AL ; INDEX TO GROUP1 CONTROL
; WORD
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
MOV AL , MODE15 ; MODE15 = 17H
OUT DX , AL ; WRITE MODE15 TO CTRL1
JMP $+2 ; DELAY
DEC DX ; POINT TO INDEX ADDRESS
MOV AL , PA1 ; PA1 = 4H
OUT DX , AL ; INDEX TO PA1
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
IN AL , DX ; READ PA1
JMP $+2