a09.asm

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;;	“验证式”	实验九  P1口输入输出实验


;文件名：MCS51\A09.ASM

;

         ORG 0000H
  ;      CLR P1.3
  DD1:   JB P1.3,DD
         CLR P1.2       ; 熄灭
  DD2:   CALL DELY
         SJMP DD1
  DD:    SETB P1.2      ; 点亮
         SJMP DD2
  DELY:  MOV R6,#00H    ;延时
  DELY1: MOV R7,#00H
  DELY2: DJNZ R7,DELY2
         DJNZ R6,DELY1
         RET