ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV A,#7FH
LP:
MOV P0,A
LCALL DELAY
RR A
SJMP LP
DELAY:
MOV R2,#200
D1:
MOV R3,#250
DJNZ R3,$
DJNZ R2,D1
RET
END
给你做Proteus仿真的
