ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV SP,#5FH
MOV R6,#0FFH
MOV R7,#0FEH
LOOP:
MOV P0,R6
MOV P1,R7
LCALL DELAY
LCALL ROTARY
SJMP LOOP
DELAY:
MOV R2,#100
DELAY1:
MOV R3,#250
DJNZ R3,$
DJNZ R2,DELAY1
RET
ROTARY:
SETB C
MOV A,R7
RLC A
MOV R7,A
MOV A,R6
RLC A
MOV R6,A
RET
END
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