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ORG 000BH
PRZERW:
MOV TL0, #9FH ;wartosc poczatkowa licznika
MOV TH0, #15H
INC R0
CLR TF0
SETB TR0
RETI ;konczy procedure obslugi przerwania
ORG 0100H
START:
SETB ET0 ;wlaczyc system przerwan dla ET0
SETB EA ;WLACZENIE PRZERWAN
CLR TR0 ;WYLACZENIE TIMERA
CLR TF0 ;JESLI BYLO USTAWIONE TO ZERUJEMY
MOV TMOD,#01H ;tryb pracy 1
MOV TL0, #9FH ;USTAWIENIE POCZATKOWEJ WARTOSCI
MOV TH0, #15H
MOV R0, #0H ;WYZEROWANIE R0
MOV R1, #0H ;SEKUNDY
SETB TR0 ;WLACZENIE TIMERA
PETLA:
MOV A, R0 ;testowanie r0
SUBB A, #14H ;20 przerwan to jedna sekunda
JZ SHOW ;jesli bylo 20 to zaswiec diody
JMP PETLA ;POWROT DO PETLI
SHOW:
MOV R0, #0H ;wyzerowanie licznika przerwan
INC R1 ;dodanie sekundy
MOV A, R1 ;pobranie wartosci sekund
CPL A ;negacja
MOV P1, A ;wlaczenie diod
JMP PETLA ;powrot do testowania licznika przerwan
NOP
NOP
NOP
JMP $
END START
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