io_loop.lst

51单片机实验课程：流水灯程序 用汇编或者c语言均可

A51 MACRO ASSEMBLER  IO_LOOP                                                              11/09/2007 20:35:11 PAGE     1


MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN IO_LOOP.OBJ
ASSEMBLER INVOKED BY: C:\Program Files\Keil\C51\BIN\A51.EXE IO_LOOP.ASM SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1             ORG     0000H
0000 2100              2             AJMP    START
0100                   3             ORG     0100H
                       4     
                       5     
                       6     
0100                   7     START:
0100 90011A            8             MOV     DPTR, #TAB      ;将显示码表的首地址赋给DPTR
0103 7808              9             MOV     R0, #8          ;流水灯循环的状态次数
0105 C294             10             CLR     P1.4            ;选中流水灯所接573锁存器
                      11     
0107                  12     LOOP:
                      13             
0107 E8               14             MOV     A, R0           
0108 93               15             MOVC    A, @A+DPTR      ;查表找到码值
0109 F580             16             MOV     P0, A           ;将码值送到P0口上
010B 3111             17             CALL    DELAY           ;延时一端时间
010D D8F8             18             DJNZ    R0, LOOP        ;判断循环有没有做完
010F 2100             19             AJMP    START           ;重新开始新一次的循环           
                      20     
                      21     
0111                  22     DELAY:                          ;定义延时程序
0111 7BFF             23             MOV     R3, #255
0113 7CFF             24     LL1:    MOV     R4, #255
0115 DCFE             25             DJNZ    R4, $
0117 DBFA             26             DJNZ    R3, LL1
0119 22               27             RET
                      28     
                      29     
011A FFFEFDFB         30     TAB:    DB      0FFH,0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,7FH     ;定义码表
011E F7EFDFBF                
0122 7F                      
                      31     
                      32             END
                                     
A51 MACRO ASSEMBLER  IO_LOOP                                                              11/09/2007 20:35:11 PAGE     2

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


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

DELAY. . . . . . .  C ADDR   0111H   A   
LL1. . . . . . . .  C ADDR   0113H   A   
LOOP . . . . . . .  C ADDR   0107H   A   
P0 . . . . . . . .  D ADDR   0080H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
START. . . . . . .  C ADDR   0100H   A   
TAB. . . . . . . .  C ADDR   011AH   A   


REGISTER BANK(S) USED: 0 


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