ORG 0 SJMP STAR ORG 3 LJMP INT0S ORG 0030H STAR:MOV IE,#81H MOV TCON,#1 MOV A,#0FEH MOV P3,#0FEH ST1:MOV P2,A ACALL DELAY RL A SJMP ST1 INT0S:PUSH ACC MOV R2,#8 LOOP:CLR A MOV P2,A ACALL DELAY MOV A,#0FFH MOV P2,A ACALL DELAY DJNZ R2,LOOP POP ACC RETI DELAY:MOV R7,#250 D1:MOV R6,#250 D2:DJNZ R6,D2 DJNZ R7,D1 RET END