ORG 0000H
      SJMP MAIN
      ORG 0030H
MAIN: MOV R1,#0FFH
      MOV R2,#0F0H
ZHENG:SETB P1.3
      SETB P1.4
      SETB P1.2
      CLR P1.1    
     ACALL DELAY
     SETB P1.1        
     ACALL DELAY    
     ACALL DELAY
     DJNZ R1,ZHENG
     MOV R1,#0FFH
     DJNZ R2,ZHENG
     MOV R1,#0FFH
     MOV R2,#0F0H
FAN: SETB P1.4
     SETB P1.3
     SETB P1.1
     CLR P1.2    
     ACALL DELAY     
     SETB P1.2
     ACALL DELAY
     ACALL DELAY
     DJNZ R1,FAN
     MOV R1,#0FFH
     DJNZ R2,FAN
     SJMP MAIN
DELAY:MOV 45H,#01H
LOOP4:MOV 46H,#05FH
LOOP5:DJNZ 46H,LOOP5
      DJNZ 45H,LOOP4
      RET
      END