ICP Electronics ROCKY-3786EV User Manual page 58

Example assembly program:
TIMER_PORT = 443H
TIMER_START = 443H
TIMER_STOP = 843H
;;INITIAL TIMER COUNTER
MOV DX, TIMER_PORT
MOV AL, 8 ;;8 seconds
OUT DX, AL
MOV DX, TIMER_START
IN AL, DX. ;;start counter
W_LOOP:
MOV DX, TIMER_STOP
IN AL, DX
MOV DX, TIMER_START
IN AL, DX ;;restart counter
;;ADD THE USER'S APPLICATION HERE
CMP EXIT_AP, 0
JNE W_LOOP
MOV DX, TIMER_STOP
IN AL, DX
;;EXIT AP
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