led_dis.lst

LED数码管的静态驱动 这里包括了最常见的LED驱动管的操作方法

A51 MACRO ASSEMBLER  LED_DIS                                                              03/15/2006 15:53:54 PAGE     1


MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN led_dis.OBJ
ASSEMBLER INVOKED BY: D:\Keil\C51\BIN\A51.EXE led_dis.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

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                      45           
0000                  46     ORG 0000H
0000 020100           47     LJMP START
                      48     
0100                  49     ORG 0100H
0100                  50     START:
0100 7900             51     MOV R1,#00H
                      52     
0102                  53     NEXT: 
0102 E9               54     MOV A,R1
0103 900122           55     MOV DPTR,#TABLE ;
0106 93               56     MOVC A,@A+DPTR  ;取段码
0107 F580             57     MOV P0,A  ;把段码送到P0口
0109 C290             58     CLR P1.0  ;选通第一位数码管的阳极位选端,即给数码管的共阳极供电
A51 MACRO ASSEMBLER  LED_DIS                                                              03/15/2006 15:53:54 PAGE     2

                      59     
010B 120115           60     LCALL DELAY
010E 09               61     INC R1
010F B90AF0           62     CJNE R1,#10,NEXT
0112 020100           63     LJMP START
                      64     
0115 7D14             65     DELAY: MOV R5,#20
0117 7E28             66     D2: MOV R6,#40
0119 7FF8             67     D1: MOV R7,#248
011B DFFE             68     DJNZ R7,$
011D DEFA             69     DJNZ R6,D1
011F DDF6             70     DJNZ R5,D2
0121 22               71     RET
                      72     
0122                  73     TABLE: ;共阳级数码管段码表
0122 C0               74             DB        0C0H;0
0123 F9               75             DB        0F9H;1
0124 A4               76             DB        0A4H;2
0125 B0               77             DB        0B0H;3
0126 99               78             DB        099H;4
0127 92               79             DB        092H;5
0128 82               80             DB        082H;6
0129 F8               81             DB        0F8H;7
012A 80               82             DB        080H;8
012B 90               83             DB        090H;9
                      84     END
A51 MACRO ASSEMBLER  LED_DIS                                                              03/15/2006 15:53:54 PAGE     3

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


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

D1 . . . . . . . .  C ADDR   0119H   A   
D2 . . . . . . . .  C ADDR   0117H   A   
DELAY. . . . . . .  C ADDR   0115H   A   
NEXT . . . . . . .  C ADDR   0102H   A   
P0 . . . . . . . .  D ADDR   0080H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
START. . . . . . .  C ADDR   0100H   A   
TABLE. . . . . . .  C ADDR   0122H   A   


REGISTER BANK(S) USED: 0 


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