流水灯.asm

包含单片机开发的入门程序

        ORG     0000H
        LJMP    START
        ORG     0030H
;START:   MOV    P0,  #0FFH
         ;LCALL  DELAY
         ;MOV    P0,  #0FEH
         ;LCALL  DELAY
         ;MOV    P0,  #0FDH
         ;LCALL  DELAY
         ;MOV    P0,  #0FBH
         ;LCALL  DELAY
         ;MOV    P0,  #0F7H
         ;LCALL  DELAY
         ;MOV    P0,  #0EFH
         ;LCALL  DELAY
         ;MOV    P0,  #0DFH
         ;LCALL  DELAY
         ;MOV    P0,  #0BFH
         ;LCALL  DELAY
         ;MOV    P0,  #7FH
         ;LCALL  DELAY
         ;AJMP   START
START:
       MOV      SP,#60H
       MOV      A,#0FEH
ROTATE:
       MOV     P0,A     ;写P1口
       RL      A        ;循环左移
       LCALL   DELAY    ;延时
       NOP
       SJMP     ROTATE
DELAY:                  ;延时子程序1s
       MOV     R0,#0AH
DELAY1:MOV     R1,#00H
DELAY2:MOV     R2,#0B2H
       DJNZ    R2,$
       DJNZ    R1,DELAY2
       DJNZ    R0,DELAY1
       RET
       END