P3口输出控制继电器程序
	ORG 0000H
	LJMP MAIN
	ORG 0040H
  MAIN:
	MOV SP,#60H
 JD: CPL P3.5 ;P3.5取反
	LCALL DELAY ;延时
	NOP
	SJMP JD
 DELAY: ;延时子程序(1秒)
	MOV R0,#0AH
 DELAY1: MOV R1,#00H
 DELAY2: MOV R2,#0B2H
	DJNZ R2,$
	DJNZ R1,DELAY2
	DJNZ R0,DELAY1
 	RET
	END