digitio.lst

51单片机用汇编实例 包括ad

A51 MACRO ASSEMBLER  DIGITIO                                                              04/17/2006 15:59:56 PAGE     1


MACRO ASSEMBLER A51 V7.09
OBJECT MODULE PLACED IN DigitIO.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE DigitIO.ASM SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

                       1     ;============================================================
                       2     ; 文件名: DigitIO.ASM
                       3     ; 功能说明: 数字量输入输出实验, P1口高4位输入, 低4位输出
                       4     ;============================================================
                       5     
0000                   6             ORG 0000H
0000 020100            7             LJMP START
0100                   8             ORG 0100H
0100 4390F0            9     START:  ORL P1, #0F0H           ;P1口高四位为输入
0103 E590             10             MOV A, P1               ;读P1口的值
0105 C4               11             SWAP A                  ;A中高,低4位交换
0106 F590             12             MOV P1, A               ;输出到P1口
0108 80F6             13             SJMP START
                      14             END
A51 MACRO ASSEMBLER  DIGITIO                                                              04/17/2006 15:59:56 PAGE     2

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


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

P1 . . . . . . . .  D ADDR   0090H   A   
START. . . . . . .  C ADDR   0100H   A   


REGISTER BANK(S) USED: 0 


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