10进制计数器.asm

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     ORG 00H

ST: CLR P2.0
  CALL  DELAY    
   SETB  P2.0
   CALL  DELAY   
    JMP  ST

DELAY: MOV R5,#5
D1:    MOV R6,#20
D2:    MOV R7,#248
       DJNZ R7,$
       DJNZ R6,D2
       DJNZ R5,D1
       RET
END