ledls.lst

单片机中LED流水灯演示程序

A51 MACRO ASSEMBLER  LEDLS                                                                05/28/2005 20:16:42 PAGE     1


MACRO ASSEMBLER A51 V6.12
OBJECT MODULE PLACED IN .\LEDLS.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE .\LEDLS.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1             ORG     0000H
0000 020003            2             LJMP    MAIN
                       3     
0003                   4     MAIN:
0003 7580FE            5             MOV     P0,#0FEH                ; 初始点亮LED1 
0006 7FFE              6             MOV     R7,#0FEH                ; 保存P0
0008                   7     MAIN_LP:
0008 120012            8             LCALL   DELAY                   ; 延时
000B EF                9             MOV     A,R7                    ; 
000C 23               10             RL      A                       ; 循环移位
000D FF               11             MOV     R7,A                    ; 保存到R7
000E F580             12             MOV     P0,A                    ; 点亮下一个LED
0010 80F6             13             JMP     MAIN_LP                 ; 不停循环
                      14     
                      15     ;===========================================================
0012                  16     DELAY:                                  ; 延时子程序
0012 78FF             17             MOV     R0,#0FFH
0014 79FF             18             MOV     R1,#0FFH
0016                  19     DLY_LP:
0016 00               20             NOP
0017 00               21             NOP
0018 D8FC             22             DJNZ    R0,DLY_LP
001A 78FF             23             MOV     R0,#0FFH
001C D9F8             24             DJNZ    R1,DLY_LP 
001E 22               25             RET
                      26             
                      27             END
A51 MACRO ASSEMBLER  LEDLS                                                                05/28/2005 20:16:42 PAGE     2

SYMBOL TABLE LISTING
------ ----- -------


N A M E             T Y P E  V A L U E   ATTRIBUTES

DELAY. . . . . . .  C ADDR   0012H   A   
DLY_LP . . . . . .  C ADDR   0016H   A   
MAIN . . . . . . .  C ADDR   0003H   A   
MAIN_LP. . . . . .  C ADDR   0008H   A   
P0 . . . . . . . .  D ADDR   0080H   A   


REGISTER BANK(S) USED: 0 


ASSEMBLY COMPLETE.  0 WARNING(S), 0 ERROR(S)