A51 MACRO ASSEMBLER  BCD_NEG                                                              07/22/2006 09:47:11 PAGE     1


MACRO ASSEMBLER A51 V8.00
OBJECT MODULE PLACED IN BCD NEG.OBJ
ASSEMBLER INVOKED BY: E:\Keil\C51\BIN\A51.EXE BCD NEG.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1                     ORG             00H
0000 753012            2                     MOV     30H,#12H
0003 753144            3                     MOV     31H,#44H
0006 753289            4                     MOV     32H,#89H
                       5     
0009 7F03              6                     MOV             R7,#03H
000B 7830              7                     MOV             R0,#30H
000D EF                8     NEG:    MOV     A,R7            ;取（字節數減一）至R2中 
000E 14                9                     DEC     A 
000F FA               10                     MOV     R2,A 
0010 E8               11                     MOV     A,R0            ;保護指針 
0011 FB               12                     MOV     R3,A 
0012 C3               13     NEG0:   CLR     C 
0013 7499             14                     MOV     A,#99H 
0015 96               15                     SUBB    A,@R0           ;按字節十進制取補 
0016 F6               16                     MOV     @R0,A           ;存回[R0]中 
0017 08               17                     INC     R0                      ;調整數據指針 
0018 DAF8             18                     DJNZ    R2,NEG0         ;處理完（R2）字節 
001A 749A             19                     MOV     A,#9AH          ;最低字節單獨取補 
001C 96               20                     SUBB    A,@R0 
001D F6               21                     MOV     @R0,A 
001E EB               22                     MOV     A,R3            ;恢復指針 
001F F8               23                     MOV     R0,A 
0020 80FE             24                     SJMP    $
                      25                     END 
A51 MACRO ASSEMBLER  BCD_NEG                                                              07/22/2006 09:47:11 PAGE     2

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


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

NEG. . . . . . . .  C ADDR   000DH   A   
NEG0 . . . . . . .  C ADDR   0012H   A   


REGISTER BANK(S) USED: 0 

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