ORG 0000H
MOV A,#1
NEXT1: MOV 20H,#0
MOV R3,#8
NEXT: INC 20H
MOV R4,20H
MOV P0,A
ACALL DELAY
RL A
DJNZ R3,NEXT
SJMP NEXT1
DELAY: MOV R7,#05H
DELAY3: MOV R5,#0FAH
DELAY2: MOV R5,#0F6H
DELAY1: DJNZ R5,DELAY1
DJNZ R6,DELAY2
DJNZ R7,DELAY3
DJNZ R4,DELAY
RET
END
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