原创 LED流水灯

;********************************************************************************
;*                                                                              *
;*    File       : wl001.asm                                                    *
;*    Date       : 2004-1-5                                                     *
;*    Version    : 1.0                                                          *
;*                                                                              *
;*    Author     : Freeman               myb33695@163.com                     *
;*    Company    : Willar            http://shop35991384.taobao.com                               *
;                          *
;********************************************************************************
;*    Descriptoon:                                                              *
;*                 LED流水灯                                                    *
;*                                                                              *
;*                                                                              *
;*                                                                              *
;*                                                                              *
;*                                                                              *
;********************************************************************************
 ORG 0000H
 LJMP MAIN

MAIN:
 MOV P0,#0FEH  ; 初始点亮LED1
 MOV R7,#0FEH  ; 保存P0
MAIN_LP:
 LCALL DELAY   ; 延时
 MOV A,R7   ;
 RL A   ; 循环移位
 MOV R7,A   ; 保存到R7
 MOV P0,A   ; 点亮下一个LED
 JMP MAIN_LP   ; 不停循环

;===========================================================
DELAY:     ; 延时子程序
 MOV R0,#0FFH
 MOV R1,#0FFH
DLY_LP:
 NOP
 NOP
 DJNZ R0,DLY_LP
 MOV R0,#0FFH
 DJNZ R1,DLY_LP
 RET
 
 END

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