東南大學(xué)微機(jī)第六次實(shí)驗(yàn)報(bào)告1

《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)東南大學(xué)《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告實(shí)驗(yàn)六8255并行輸入輸出XX：學(xué)號(hào)：專業(yè)：實(shí)驗(yàn)室：計(jì)算機(jī)硬件技術(shù)實(shí)驗(yàn)時(shí)間：年05月22日?qǐng)?bào)告時(shí)間：年05月29日評(píng)定成績(jī)：審閱教師：0《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)實(shí)驗(yàn)?zāi)康呐c內(nèi)容實(shí)驗(yàn)?zāi)康模┱莆?255方式0的工作原理及使用方法，利用直接輸入輸出進(jìn)行控制顯示；）掌握8段數(shù)碼管的動(dòng)態(tài)刷新顯示控制；（二）實(shí)驗(yàn)內(nèi)容及要求、8段數(shù)碼管靜態(tài)顯示：編程從鍵盤輸入一位十進(jìn)制數(shù)字（0~9（必做）、8段數(shù)碼管動(dòng)態(tài)顯示：在兩個(gè)數(shù)碼管上同時(shí)顯示不同的兩位數(shù)字或字母，保持不變直至退出。（如56或7f）（必做）、靜態(tài)顯示：用邏輯電平開關(guān)預(yù)置某個(gè)數(shù)字（0～）的二進(jìn)制碼，將該數(shù)據(jù)用8255的C口讀入，并用A口輸出，并在數(shù)碼管顯示出來。、動(dòng)態(tài)顯示：在兩個(gè)數(shù)碼管上滾動(dòng)循環(huán)顯示不同的～f01，12，，······9a······f0，一直循環(huán)直至退出）注：3,4中選做一題，必做一題二.實(shí)驗(yàn)基本原理（一）實(shí)驗(yàn)接線圖1《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)PA0～PA6分別接數(shù)碼管的～gPC0～PC7分別邏輯電平開關(guān)的K0～K7位選端S1接＋5V位選端S0接地?cái)?shù)碼管dp端接地必做1，3接線圖PA0～PA6分別接數(shù)碼管的～g位選端S0、S1接8255C口的PC0、端必做2接線圖（二）程序流程圖2《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)開始設(shè)置8255C口

輸入口輸出從口輸入數(shù)據(jù)將此數(shù)據(jù)自口輸出N有鍵按下嗎？Y結(jié)束圖1.18255簡(jiǎn)單輸入輸出程序流程圖圖2.18255動(dòng)態(tài)顯示56程序流程圖三方案實(shí)現(xiàn)與測(cè)試（或調(diào)試）必做實(shí)驗(yàn)：datasegmentint21hioportequ0ec00h-0280hmovah,01;從鍵盤接收字符io8255aequioport+288h

int21hio8255bequioport+28bhcmpal,'0';是否小于0leddb3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fhjlexit若是則退出mesg1db0dh,0ah,'Inputanum(0--9h):',0dh,0ah,'$'dataendscmpal,'9';是否大于9jgexit;若是則退出subal,30h將所得字符的ASCIIcodesegment碼減30Hassumecs:code,ds:datastart:movax,datamovbx,offsetled;bx為數(shù)碼表的起始地movds,ax址movdx,io8255b使8255的A口為

xlat求出相應(yīng)的段碼輸出方式movdx,io8255a從8255的A口輸出movax,80h

outdx,aloutdx,aljmpsss;轉(zhuǎn)SSSsss:movdx,offsetmesg1顯示提示信息

exit:movah,4ch;返回DOSmovah,09h

int21h3《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)codeendsendstart必做實(shí)驗(yàn)：datasegmentpopdiioportequ0ec00h-0280hmoval,0io8255aequioport+28ahmovdx,io8255aio8255bequioport+28bhoutdx,alio8255cequioport+288hmovbh,0leddbmovsi,offsetled3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fhaddsi,bxbuffer1db5,6moval,byteptr[si]bzdw?movdx,io8255cdataendsoutdx,alstackssegmentstackmoval,byteptrbzdb100dup(?)movdx,io8255astacksendsoutdx,alcodesegmentmovcx,3000assumecs:code,ds:data,ss:stacksdelay:loopdelaymovbh,byteptrbzstart:movax,stacksshrbh,1movss,axjnzlllmovax,datamovdx,0ffhmovds,axmovah,06hmovdx,io8255bint21hmoval,80hjeloop2outdx,almovdx,io8255amovdi,offsetbuffer1;23moval,0loop2:movbh,02houtdx,allll:movbyteptrbz,bhmovah,4chpushdiint21hdecdicodeendsadddi,bzendstartmovbl,[di]選做實(shí)驗(yàn)：datasegmentstackssegmentstackioportequ0ec00h-0280h;tpcdb100dup(?)卡中設(shè)備的stacksendsio地址codesegmentio8255aequioport+288h;8255A口地址assumecs:code,ds:data,ss:stacksio8255bequioport+28bh;8255控制寄存器mainprocfar端口地址start:movax,stacksio8255cequioport+28ah;8255C口地址movss,axleddb

movax,data3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,79h

movds,axdataendsmovdx,io8255b;設(shè)8255為C口1《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)》實(shí)驗(yàn)報(bào)告學(xué)號(hào)輸入,A口輸出show:movbx,offsetled;bx為數(shù)碼表的moval,8bh起始地址outdx,alxlat;求出相應(yīng)的段碼inout:movdx,io8255c從C口輸入

movdx,io8255a從A口輸出一數(shù)據(jù)剛才自C口所輸入的數(shù)據(jù)inal,dxoutdx,alcmpal,30h;是否小于0

movdl,0ffh;判斷是否有按鍵jlerror若是則顯示Emovah,06hcmpal,39h;是否大于9int21hjgerror;若是則顯示Ejzinout;若無,則繼續(xù)自C

subal,30h口輸入,A口輸出jmpshowmovah,4ch;否則返回DOSerror:moval,79h

int21hmovdx,io8255a

mainendpoutdx,alcodeends顯示Eendstart選做實(shí)驗(yàn)：datasegmentbegin3:movcount1,0fh

ioportequ0ec00h-0280hbegin2:movcount,3000

io8255aequioport+288hmovax,count

io8255bequioport+289hbegin1:movcount,ax

io8255cequioport+28ahmovcx,02h

io8255dequioport+28bhmovah,02h

leddbleasi,buffer1

3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,77h,7ch,39hmovbx,offsetled

,5eh,79h,71h;段碼begin:moval,[si]xlatbuffer1db0,1存放要顯示的十位和個(gè)movdx,io8255a位bzdw?位碼countdw?count1dw?dataendsmystacksegmentparastackdb100dup(?)mystackendscodesegmentassumecs:code,ds:data,ss:mystackstart:movax,datamovds,axmovdx,io8255b;將8255設(shè)為Aoutdx,almoval,ahmovdx,io8255coutdx,alcalldelaymoval,0outdx,alincsishrah,1loopbeginmovax,countdecaxjnzbegin1口輸出movsi,0moval,80hincbuffer1[si]outdx,al

incsi1《微機(jī)實(shí)驗(yàn)及課程設(shè)計(jì)實(shí)驗(yàn)告學(xué)號(hào)incbuffer1[si]delayprocdeccount1pushcxjnzbegin2movcx,0ffffhmovsi,offsetbuffer1delay1:loopdelay1movbyteptr[si],0popcxmovbyteptr[si+1],1retmovdx,0ffhdelayendpmovah,06hexit:movah,4chint21hint21hjebegin3codeendsjneexitendstart四．分析與結(jié)、8255作為一個(gè)并行輸入輸出接口電路可實(shí)現(xiàn)動(dòng)態(tài)和靜態(tài)的輸入輸出，靜態(tài)實(shí)驗(yàn)中，入數(shù)據(jù)，實(shí)際上就是用計(jì)算機(jī)讀取通過8255輸出給外設(shè)的過程，動(dòng)態(tài)實(shí)驗(yàn)中計(jì)算機(jī)接讀取內(nèi)存中的數(shù)