【正文】 （選中），S0、dp接地（關(guān)閉）。編程從鍵盤輸入一位十進制數(shù)字（0～9），在七段數(shù)碼管上顯示出來。：二、程序流程圖三、實驗源程序 data segment ioport equ 0c400h0280h io8255a equ ioport+288h io8255b equ ioport+28bh led db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh mesg1 db 0dh,0ah,39。Input a num(09h):39。,0dh,0ah,39。$39。 data ends code segment assume cs:code,ds:data start: mov ax,data mov ds,ax mov dx,io8255b。使8255的A口為輸出方式mov ax,80h out dx,al sss: mov dx,offset mesg1。顯示提示信息mov ah,09h int 21h mov ah,01。從鍵盤接收字符int 21h cmp al,39。039。是否小于0 jl exit。若是則退出cmp al,39。939。是否大于9 jg exit。若是則退出sub al,30h。將所得字符的ASCII碼減30H mov bx,offset led。bx為數(shù)碼表的起始地址xlat。求出相應的段碼mov dx,io8255a。從8255的A口輸出out dx,al jmp sss。轉(zhuǎn)SSS exit: mov ah,4ch。返回DOS int 21h code ends end start四、總結(jié)通過自主設計實驗，提升了運用已經(jīng)學過的理論知識與實踐的聯(lián)系的能力，復習鞏固了芯片的使用方法。八、參考文獻1．戴勝華,張凡,[M].北京：北京交通大學出版社, 、編程和接口技術(shù)大全[M].北京：機械工程出版社,第五篇：北京郵電大學微機原理與接口技術(shù)硬件實驗報告信息與通信工程學院微機原理與接口技術(shù)硬件實驗報告班姓 學 序級：名：號：號：日期： 20151030——20151226 目錄實驗一 I/O地址譯碼.............................................................................................................................3一、實驗目的............................................................................................................................3二、實驗原理及內(nèi)容..............................................................................................................3三、硬件接線圖與軟件程序流程圖..................................................................................3四、源程序.......................................................................................................................................4五、實驗結(jié)果..................................................................................................................................5六、實驗總結(jié)..................................................................................................................................5七、實驗收獲與心得體會...........................................................................................................5 實驗二簡單并行接口..............................................................................................................................5一、實驗目的............................................................................................................................5二、實驗原理及內(nèi)容..............................................................................................................5三、硬件接線圖與軟件程序流程圖........................................................................................6四、源程序.......................................................................................................................................6五、實驗結(jié)果..................................................................................................................................7六、實驗總結(jié)..................................................................................................................................7七、實驗收獲與心得體會...........................................................................................................7 實驗四七段數(shù)碼管..................................................................................................................................7一、實驗目的..................................................................................................................................7二、實驗原理及內(nèi)容....................................................................................................................8三、硬件接線圖與軟件程序流程圖........................................................................................8四、源程序.......................................................................................................................................9五、實驗結(jié)果...............................................................................................................................11六、實驗總結(jié)...............................................................................................................................11七、實驗收獲與心得體會........................................................................................................11 實驗八可編程定時器／計數(shù)器（8253/8254）.........................................................................11一、實驗目的...............................................................................................................................11二、實驗原理及內(nèi)容.................................................................................................................11三、硬件接線圖與軟件程序流程圖.....................................................................................12四、源程序....................................................................................................................................13五、實驗結(jié)果...............................................................................................................................17六、實驗總結(jié)與思考題............................................................................................................17七、實驗收獲與心得體會........................................................................................................17 實驗十六串行通訊8251....................................................................................................................18一、實驗目的...............................................................................................................................18二、實驗原理及內(nèi)容.................................................................................................................18三、硬件接線圖與軟件程序流程圖.....................................................................................18四、源程序....................................................................................................................................19五、實驗結(jié)果...............................................................................................................................22六、實驗總結(jié)與思考題............................................................................................................22七、實驗收獲與心得體會...........................................