ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV A,#0FEH
MOV B,#0FFH
MOV R2,#16
LOOP:
MOV P1,A
MOV P2,B
LCALL DELAY
CLR C
RLC A
XCH A,B
RLC A
XCH A,B
DJNZ R2,LOOP
MOV R2,#3
LOOP1:
MOV P1,#00H
MOV P2,#00H
LCALL DELAY
MOV P1,#0FFH
MOV P2,#0FFH
LCALL DELAY
DJNZ R2,LOOP1
SJMP $
DELAY:
MOV R3,#200
DLY:
MOV R4,#250
DJNZ R4,$
DJNZ R3,DLY
RET
END
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