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      ORG 0000H 
      LJMP MAIN 
      ORG 002BH 
 MAIN:MOV P1,#0FFH 
      ACALL DELAY 
      MOV A,P1 
      JB ACC.0,CHK 
      JB ACC.1,LLL 
      SJMP MAIN 
 CHK:JB ACC.1,MAIN 
 RRR:MOV P1,#1CH 
      ACALL DELAY 
      SJMP MAIN 
 LLL:MOV P1,#0E0H 
      ACALL DELAY 
      SJMP MAIN 
DELAY:MOV R2,#0A0H 
LOOP2:MOV R3,#0FFH 
LOOP1:DJNZ R3,LOOP1 
      DJNZ R2,LOOP2 
      RETI