西南交大-微机接口-实验代码全.docVIP

开关实验:

io8255a equ288h

io8255c equ28ah

io8255z equ28bh

codesegment

assumecs:code

start:

movdx,io8255z

moval,8bh

outdx,al

inout:

movdx,io8255c

inal,dx

movdx,io8255a

outdx,al

movdl,0ffh

movah,06h

int21h

jzinout

movah,4ch

int21h

codeends

endstart

交通灯控制实验：

datasegment

io8255cequ28Ah

io8255zequ28Bh

portc1db21h

db81h,01h,81h,01h,81h,01h,81h,01h,81h,01h,81h,01h

db44h

db42h,40h,42h,40h,42h,40h,42h,40h,42h,40h,42h,40h

db0ffh

dataends

codesegment

assumecs:code,ds:data

start:

movax,data

movds,ax

movdx,io8255z

moval,90h

outdx,al

movdx,io8255c

re_on:

movbx,0;

on:

moval,portc1[bx]

cmpal,0ffh

jzre_on

outdx,al

incbx

movcx,200

testal,24h

jzde1

movcx,10000

de1:movdi,9000

de0:

decdi

jnzde0

loopde1

pushdx

movah,06h

movdl,0ffh

int21h

popdx

jzon

exit:movah,4ch

int21h

codeends

endstart

七段数码管静态显示实验:

io8255a equ288h

io8255z equ28bh

datasegment

led db3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh

mesg1 db0dh,0ah,’Inputanum(0-9),otherkeyisexit’,0dh,0ah,’$’

dataends

codesegment

assumecs:code,ds:data

start:

movax,data

movds,ax

movdx,io8255z

movax,80h

outdx,al

sss:

movdx,offsetmesg1

movah,09h

int21h

movah,01

int21h

cmpal,’0’

jlexit

cmpal,’9’

jgexit

subal,30h

movbx,offsetled

xlat

movdx,io8255a

outdx,al

jmpsss

exit:

movah,4ch

int21h

codeends

endstart

数码管循环显示00—99

datasegment

io8255aequ288h

io8255bequ289h

io8255cequ28ah

io8255zequ28bh

leddb3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh

buffer1db0,0

bzdw01,00

dataends

codesegment

assumecs:code,ds:data

start:

movax,data

movds,ax

movdx,io8255b;将8255设为A口输出

moval,80h

outdx,al

movdi,offsetbuffer1;设di为显示缓冲区

loop1:movcx,0300h;循环次数

loop2:movbh,02

lll:movbyteptrbz,bh

pushdi

decdi

adddi,