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《西南交大 微机接口 实验代码》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、开关实验:io8255aequ288hio8255cequ28ahio8255zequ28bhcodesegmentassumecs:codestart:movdx,io8255z moval,8bh outdx,alinout: movdx,io8255c inal,dx movdx,io8255a outdx,al movdl,0ffh movah,06h int21h jzinout movah,4ch int21hcodeendsendstart交通灯控制实验：datasegmentio8255cequ28Ahio8255zequ28Bhportc1d
2、b21hdb81h,01h,81h,01h,81h,01h,81h,01h,81h,01h,81h,01hdb44hdb42h,40h,42h,40h,42h,40h,42h,40h,42h,40h,42h,40hdb0ffhdataendscodesegmentassumecs:code,ds:datastart:movax,datamovds,axmovdx,io8255zmoval,90houtdx,almovdx,io8255cre_on:movbx,0;on:moval,portc1[bx]cmpal,0ffhjzre_onoutdx,alincbx movcx,200
3、 testal,24h jzde1 movcx,10000de1:movdi,9000de0:decdijnzde0loopde1pushdxmovah,06h movdl,0ffh int21h popdx jzonexit:movah,4chint21hcodeendsendstart七段数码管静态显示实验:io8255aequ288hio8255zequ28bhdatasegmentleddb3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fhmesg1db0dh,0ah,’Inputanum(0-9),otherkeyisexit’,0d
4、h,0ah,’$’dataendscodesegment assumecs:code,ds:datastart:movax,datamovds,axmovdx,io8255zmovax,80h outdx,alsss:movdx,offsetmesg1movah,09hint21hmovah,01int21hcmpal,’0’jlexitcmpal,’9’jgexitsubal,30hmovbx,offsetled xlat movdx,io8255a outdx,al jmpsssexit:movah,4chint21hcodeendsendstart数码管循环显示00
5、—99datasegmentio8255aequ288hio8255bequ289hio8255cequ28ahio8255zequ28bhleddb3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fhbuffer1db0,0bzdw01,00dataendscodesegmentassumecs:code,ds:datastart:movax,datamovds,axmovdx,io8255b;将8255设为A口输出moval,80houtdx,almovdi,offsetbuffer1;设di为显示缓冲区loop1:movcx,0300h;循环次数loo
6、p2:movbh,02lll:movbyteptrbz,bhpushdidecdiadddi,bzmovbl,[di];bl为要显示的数popdimovbh,0movsi,offsetled;置led数码管偏移地址为SIaddsi,bx;求出对应的led码moval,byteptr[si]movdx,io8255c;自8255A的口输出outdx,almoval,byteptrbz;使相应的数码管亮movdx,io8255coutdx,alpushcxmovcx,3000;若显示过快，可更改cx值最大为0ffffhdelay:loopdelay;延时popcxmovbh,bytept
7、rbzshrbh,1jnzllllooploop2;循环延时movax,wordptr[di]movah,01int16hjneexit;有键按下转exitmovax,wordptr[di]incalaaamov[di],al;al中为十位mov[di+1],ah;ah中为个位jmploop1exit:movdx,io8255amoval,0;关掉数码管显示outdx,almovah,4ch;返回DOSint21hcodeendsendstart键盘接口实
