led.lst

初学者首选各种实验原代码

A51 MACRO ASSEMBLER  LED                                                                  05/04/2004 08:20:14 PAGE     1


MACRO ASSEMBLER A51 V7.02
OBJECT MODULE PLACED IN LED.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE LED.ASM SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

                       1     ;-----------------------------
                       2     ;LED4发光二极管闪动实验
                       3     ;编写SG
                       4     ;20040418
                       5     ;-----------------------------
0000                   6             ORG 0000H
0000 0102              7             AJMP MAIN
0002                   8     MAIN:
0002 00                9             NOP                             ;CPU空操作
0003 00               10             NOP                             ;CPU空操作
0004                  11     LOOP:
0004 C2A0             12             CLR P2.0                ;P2.0对应LED4管脚低电平点亮LED
0006 120010           13             LCALL DELAY             ;延时500MS,亮LED500MS
0009 D2A0             14             SETB P2.0               ;P2.0对应LED4管脚高电平熄灭LED
000B 120010           15             LCALL DELAY             ;延时500MS,灭LED500MS
000E 0104             16             AJMP LOOP               ;循环
                      17     
                      18     ;--------------------------
                      19     ;500MS延时子程序
                      20     ;--------------------------
0010                  21     DELAY:
0010 78FF             22             MOV R0,#0FFH
0012 79FF             23             MOV R1,#0FFH
0014                  24     DELAY_2:        
0014 79FF             25             MOV R1,#0FFH
0016                  26     DELAY_1:
0016 00               27             NOP
0017 00               28             NOP
0018 00               29             NOP
0019 00               30             NOP
001A 00               31             NOP
001B 00               32             NOP
001C D9F8             33             DJNZ R1,DELAY_1
001E D8F4             34             DJNZ R0,DELAY_2
0020 22               35             RET
                      36     ;------------------------------
                      37     ;END源程序到此结束后面的不被编译
                      38     ;-----------------------------
                      39             END
A51 MACRO ASSEMBLER  LED                                                                  05/04/2004 08:20:14 PAGE     2

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


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

DELAY. . . . . . .  C ADDR   0010H   A   
DELAY_1. . . . . .  C ADDR   0016H   A   
DELAY_2. . . . . .  C ADDR   0014H   A   
LOOP . . . . . . .  C ADDR   0004H   A   
MAIN . . . . . . .  C ADDR   0002H   A   
P2 . . . . . . . .  D ADDR   00A0H   A   


REGISTER BANK(S) USED: 0 


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