led.lst

基于msc单片机仿真机的仿真程序

A51 MACRO ASSEMBLER  LED                                                                  09/16/2006 15:24:16 PAGE     1


MACRO ASSEMBLER A51 V7.08a
OBJECT MODULE PLACED IN led.OBJ
ASSEMBLER INVOKED BY: D:\Keil\C51\BIN\A51.EXE led.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1           org 0000h
0000 802E              2           jmp start
0030                   3           org 0030h         ;主程序从这个地址开始存放
0030                   4     start:
0030 90004E            5           mov dptr,#table   ;将表格的首地址送DPTR
0033 E4                6     loop: clr a
0034 93                7           movc a,@a+dptr    ;读取表格首地址的内容
0035 B40102            8           cjne a,#01h,loop1 ;查看是否是01H.如果是01H,重新开始循环
0038 80F6              9           jmp start
003A F580             10     loop1:mov p0,a           ;将要显示的代码送P0口
003C 7C14             11           mov r4,#20         ;延时200ms（0.2S）
003E 1143             12           call delay         ;调用延时
0040 A3               13           inc dptr           ;DPTR加1,为读取下一个地址的内容作准备
0041 80F0             14           jmp loop
                      15     ;************** 延时子程序 ****************
0043                  16     delay:
0043 7914             17           mov r1,#20         ;延时10ms子程序
0045 7AC8             18     d1:   mov r2,#200
0047 DAFE             19           djnz r2,$
0049 D9FA             20           djnz r1,d1
004B DCF6             21           djnz r4,delay
004D 22               22           ret
004E FEFDFBF7         23     table:db 0feh,0fdh,0fbh,0f7h         ;左移
0052 EFDFBF7F         24           db 0efh,0dfh,0bfh,07fh
0056 FEFDFBF7         25           db 0feh,0fdh,0fbh,0f7h          ;左移
005A EFDFBF7F         26           db 0efh,0dfh,0bfh,07fh
005E E7DBBD7E         27           db 0e7h,0dbh,0bdh,07eh
0062 FF7EBDDB         28           db 0ffh,07eh,0bdh,0dbh
0066 E7FF             29           db 0e7h,0ffh
0068 7FBFDFEF         30           db 7fh,0bfh,0dfh,0efh           ;右移
006C F7FBFDFE         31           db 0f7h,0fbh,0fdh,0feh
0070 7FBFDFEF         32           db 7fh,0bfh,0dfh,0efh             ;右移
0074 F7FBFDFE         33           db 0f7h,0fbh,0fdh,0feh
                      34           ;db 00h,00h,0ffh,0ffh,00h,00h,0ffh,0ffh   ;闪烁2次
0078 01               35           db 01h   ;结束码
                      36           end
A51 MACRO ASSEMBLER  LED                                                                  09/16/2006 15:24:16 PAGE     2

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


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

D1 . . . . . . . .  C ADDR   0045H   A   
DELAY. . . . . . .  C ADDR   0043H   A   
LOOP . . . . . . .  C ADDR   0033H   A   
LOOP1. . . . . . .  C ADDR   003AH   A   
P0 . . . . . . . .  D ADDR   0080H   A   
START. . . . . . .  C ADDR   0030H   A   
TABLE. . . . . . .  C ADDR   004EH   A   


REGISTER BANK(S) USED: 0 


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