NuDAQ PET-48DIO, Руководство пользователя, Страница: 32 / 38

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Control Programming
To set timer
MOV DX , INDEX ; DATA OF INDEX SAME AS I/O
; ADDRESS THAT SET BY SW1
MOV AL , C531 ; C531 = 81H
OUT DX , AL; INDEX TO COUNT 1
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
MOV AL , 30H ; LOAD LEAST BYTE 30H
OUT DX , AL; LOAD LEAST BYTE
JMP $+2 ; DELAY
MOV AL , 10H ; LOAD MOST BYTE 10H
OUT DX , AL; LOAD MOST BYTE
JMP $+2 ; DELAY
DEC DX ; POINT TO INDEX ADDRESS
MOV AL , C532 ; C532 = 82H
OUT DX , AL; INDEX TO COUNT 2
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
MOV AL , 10H ; LOAD LEAST BYTE 10H
OUT DX , AL; LOAD LEAST BYTE
JMP $+2 ; DELAY
MOV AL , 00H ; LOAD MOST BYTE 00H
OUT DX , AL; LOAD MOST BYTE
JMP $+2 ; DELAY
To clear and enable interrupt
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 1 8255
; CONTROL WORD
JMP $+2 ; DELAY
INC DX ; POINT TO DATA READ/WRITE
; ADDRESS
IN AL , DX; DUMMY READ TO CLEAR
; AND ENABLE INTERRUPT
3.4.2 Programming in C language
The following parts are example programs written in C language for
reference.
Note : These softwares are only partial of complete program, so you can
not execute them directly.