8255a.lst

单片机并口扩展芯片8255A源码

A51 MACRO ASSEMBLER  8255A                                                                08/11/2008 12:54:42 PAGE     1


MACRO ASSEMBLER A51 V8.00d
OBJECT MODULE PLACED IN 8255A.OBJ
ASSEMBLER INVOKED BY: d:\Keil\C51\BIN\A51.EXE 8255A.ASM SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1     ORG 0000H
0000 020003            2     LJMP INIT
0003                   3     INIT:
0003 900003            4     MOV DPTR,#0003H 
0006 74A6              5     MOV A,#0A6H
0008 F0                6     MOVX @DPTR,A
0009                   7     START:
0009 900000            8     MOV DPTR,#0000H 
000C 74FE              9     MOV A,#0FEH
000E F0               10     MOVX @DPTR,A
000F 7802             11     MOV R0,#2
0011 111B             12     ACALL DELAY
0013 F0               13     MOVX @DPTR,A
0014 7814             14     MOV R0,#20
0016 111B             15     ACALL DELAY
0018 020009           16     LJMP START
001B                  17     DELAY:
001B 7AC8             18     MOV R2,#200
001D 79C8             19     DEL2:MOV R1,#200
001F D9FE             20     DEL1:DJNZ R1,DEL1
0021 DAFA             21     DJNZ R2,DEL2
0023 D8F6             22     DJNZ R0,DELAY
0025 22               23     RET
*** WARNING #A41 IN 23 (8255A.ASM, LINE 23): MISSING 'END' STATEMENT
A51 MACRO ASSEMBLER  8255A                                                                08/11/2008 12:54:42 PAGE     2

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


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

DEL1 . . . . . . .  C ADDR   001FH   A   
DEL2 . . . . . . .  C ADDR   001DH   A   
DELAY. . . . . . .  C ADDR   001BH   A   
INIT . . . . . . .  C ADDR   0003H   A   
START. . . . . . .  C ADDR   0009H   A   


REGISTER BANK(S) USED: 0 


ASSEMBLY COMPLETE.  1 WARNING(S), 0 ERROR(S)