123.lst

如何点亮2个LED发光管,经典的C51单片机程序,新手可直接使用

A51 MACRO ASSEMBLER  123                                                                  07/31/2007 19:15:41 PAGE     1


MACRO ASSEMBLER A51 V6.12
OBJECT MODULE PLACED IN .\123.OBJ
ASSEMBLER INVOKED BY: D:\keil\C51\BIN\A51.EXE .\123.ASM SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1     LOOP: 
                       2     
0000 C290              3     CLR P1.0;用CLR命令使P1.1输出低电平,点亮LED
                       4     
0002 C292              5     CLR P1.2;用CLR命令使P1.1输出低电平,点亮LED
                       6     
0004 120009            7     LCALL DELAY;调用延时子程序DELAY
                       8     
0007 0100              9     AJMP LOOP;通笰JMP执行LOOP,从最开始循环执行,无限循环下去
                      10     
0009 7FFA             11     DELAY: MOV R7,#250
000B 7EFA             12     D1: MOV R6,#250
000D DEFE             13     D2: DJNZ R6,D2
000F DFFA             14     DJNZ R7,D1
0011 22               15     RET
                      16     END
                             
                             
A51 MACRO ASSEMBLER  123                                                                  07/31/2007 19:15:41 PAGE     2

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


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

D1 . . . . . . . .  C ADDR   000BH   A   
D2 . . . . . . . .  C ADDR   000DH   A   
DELAY. . . . . . .  C ADDR   0009H   A   
LOOP . . . . . . .  C ADDR   0000H   A   
P1 . . . . . . . .  D ADDR   0090H   A   


REGISTER BANK(S) USED: 0 


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