課程設計-8086電子時鐘設計

1、 附錄2電子時鐘程序;8255用作讀鍵盤信息;8253提供時鐘信號;led采用動態(tài)顯示modelsmall.stack50，數(shù)據(jù)段databufd60,0,0,0,0,0;顯示緩沖區(qū);數(shù)碼管筆形碼ledd63FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,80hhourd608h;時緩沖單元mindb30h;分緩沖單元seed630h;秒緩沖單元mseod60;毫秒緩沖單元dexdb0;筆形碼索引值;鍵盤編碼表keytabDW57FH,5BFH,5DFH,5EFH,5FEH,5FDH,5FBH,5F7HDW67FH,6BFH,6DFH,6EFH,6FEH,6FDH

2、,6FBH,6F7Hkeyenddw7ffhagekeydb12;鍵齡oldkeydw0;鍵碼字保存keynumd60;鍵號keyokdb0;按鍵響應標記stated60;系統(tǒng)狀態(tài)，。一運行態(tài);1一修改態(tài)keymddb0;修改鍵標記，B一修改時;C一修改分;D-修改秒somed60;時間設定單元，保存鍵盤輸入的時間二代碼段code;主程序:;實現(xiàn)8253的設置，中斷向量的設置，檢測系統(tǒng)大鍵盤信號，有按鍵就結束程序返回系統(tǒng)。mainprocfarstart:movax,data;設置數(shù)據(jù)段和附加段movds,axmoves,axcli;關中斷;設置8253，2l，方式2,輸入250kHz，輸出2

3、00Hzmovdx,233hmova1,74houtdx,alm-dx.231hmovax,1250outdx,almoval,ahoutdx,al;保存原中斷向量a1,Obhah,35b21hesbxdsJintnushvushPush;設置新中斷向量movdx,offsetintpromovax,segintpromovds,axmova1,Obhmovah,25htm21h;打開中斷屏蔽popdsina1,21handal,Of7hout21h,a1sti；開中斷;等持按鍵，返回系統(tǒng)wat:movah,lintlbhjzwat;回復中斷向量popdxpopdsmova1,Obhmovah

4、,25hint21h;退出程序，返回系統(tǒng)movax,4e00him21h，中斷一f程序：;完成時鐘處理、鍵盤監(jiān)控和顯示功能tntproprocnearpushds;保存寄存器pushaxpushcxaxax,data;設置數(shù)據(jù)段和代碼段寄存器ds,ax;不是修改狀態(tài)才走時鐘nush;時鐘處理模塊，以5毫秒為單位調整時、分秒。elk:incmsecnU魷、hcnnlmmladdamlcnnl抑mladdal,lmin,almin,60hdaacmPjnenextmovmin,0moval,houraddal,ldaamovhour,alcmphour,24hjnenextmovhour,0，鍵盤

5、監(jiān)控模塊next:decagekeyjznextljmpdspnextl:movagekey,12movdx,223h;設置PA輸出，PB輸入mova1,82houtdx,almova1,0;A口輸出低電平，讀B口movdx,220houtdx,almovdx,221hinal,dxmovbh,almovdx,223h;設置PB輸出，PA輸入mova1,90houtdx,almoval,();bmovdx,22lhoutdx,almovdx,220binal,dxmovbl,al;i?andbx,7ffh;去除鍵碼中無用位數(shù)cmpbx,7ffhjne卜丫。口;有按鍵則進入按鍵處理mov卜6丫。

6、卜,0;無按鍵則清除響應標志退出按鍵處理jmpdspkeyon:cmp.bx,oldkeyjekeyonl;E經去抖動則直接處理按鍵movagekey,4;有新按鍵則設置鍵齡退出中斷movkeyok,0movoldkey,bximpdspkeyonl:cmpkeyok,ljne1按鍵已響應則退出鍵盤處理impdsp11:movkeyok,l;設立按鍵響應標記stdleadi,keyend;指向鍵碼表movax,bx;讀取鍵號，地址遞減，cx的值為鍵號movcx,17repnescaswjekeyon2impdspkeyon2:movkeynum,cl;保存鍵號cmpstate,0;系統(tǒng)在修改態(tài)

7、否？jnekeyon3;跳到修改態(tài)的處理cmpkeynum,0ah;為A鍵否jnekeybmovkeymd,l;作a鍵修改標志movhour,0aah沙時顯示為一movstate,l;進入修改態(tài)impdspkeyb:cmpkeynum,Obh;為B鍵否jnekeyemovkeymd,2;作b鍵修改標志movmin,0aah;分鐘異示為.movstate,l;進入修改態(tài)impdspkeyc:cmpkeynum,Och;為c鍵否jekeyclimpdspkeycl:movkeymd,3;作c鍵修改標志movsec,0aahmovstate,l;秒顯示為.impdspkeyon3:cmpkeynum

8、,9;在修改態(tài)，判斷是否為數(shù)字鍵jbekeys;二24jbkey-3movhour,0;大于24時，輸入為。movsdme,0;清除時間單元impdspkey-3:moval,stimemovhour,al;小于24時，輸入設定時間movstime,0;清除時間單元impdspkey-2:-pkeymd,2;將修改分鐘標志jnekeyen4movkeymd,0;請除修改分鐘標志cmpsfme,60hjbkeyen5movmin,0movstime,0impdspkeyen5:moval,stimemovmfn,almovstime,0impdspkeyen4:cmpkeymd,3;將修改秒jn

9、edspmovkeymd,0cmpstime,60hj6keyen6movsec,0movstime,0impdspkeyen6:moval,stimemovsec,almovstime,0顯示模塊dsp:movsi,0;將時、分、秒信號拷貝到顯示緩沖區(qū)movc1,4movch,2moval,hourlpl:rolal,clmovah,alanda1,Oflrmov6u兀sii,almoval,ahmemdecchjazlplmovch,2moval,mirIp2:rolal,clmovab,alanda1,Oflrmov6u幾simoval,ahmesdecchjnz)p2movcb,2moval,secIp3:rolal,clmovah,alanda1,Oflrmovbu兀si,almoval,ahme勺decchjnzlp3movcl,dex;顯示數(shù)碼管的某一位moval,lrolal,clmovdx,210hout擊alandax,0moval,dex