【正文】 （選中），S0、dp接地（關(guān)閉）。編程從鍵盤輸入一位十進(jìn)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(shí)驗(yàn)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(yīng)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(shè)計(jì)實(shí)驗(yàn)，提升了運(yùn)用已經(jīng)學(xué)過的理論知識與實(shí)踐的聯(lián)系的能力，復(fù)習(xí)鞏固了芯片的使用方法。八、參考文獻(xiàn)1．戴勝華,張凡,[M].北京：北京交通大學(xué)出版社, 、編程和接口技術(shù)大全[M].北京：機(jī)械工程出版社,第五篇：北京郵電大學(xué)微機(jī)原理與接口技術(shù)硬件實(shí)驗(yàn)報(bào)告信息與通信工程學(xué)院微機(jī)原理與接口技術(shù)硬件實(shí)驗(yàn)報(bào)告班姓 學(xué) 序級：名：號：號：日期： 20151030——20151226 目錄實(shí)驗(yàn)一 I/O地址譯碼.............................................................................................................................3一、實(shí)驗(yàn)?zāi)康?...........................................................................................................................3二、實(shí)驗(yàn)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(shí)驗(yàn)結(jié)果..................................................................................................................................5六、實(shí)驗(yàn)總結(jié)..................................................................................................................................5七、實(shí)驗(yàn)收獲與心得體會(huì)...........................................................................................................5 實(shí)驗(yàn)二簡單并行接口..............................................................................................................................5一、實(shí)驗(yàn)?zāi)康?...........................................................................................................................5二、實(shí)驗(yàn)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(shí)驗(yàn)結(jié)果..................................................................................................................................7六、實(shí)驗(yàn)總結(jié)..................................................................................................................................7七、實(shí)驗(yàn)收獲與心得體會(huì)...........................................................................................................7 實(shí)驗(yàn)四七段數(shù)碼管..................................................................................................................................7一、實(shí)驗(yàn)?zāi)康?.................................................................................................................................7二、實(shí)驗(yàn)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(shí)驗(yàn)結(jié)果...............................................................................................................................11六、實(shí)驗(yàn)總結(jié)...............................................................................................................................11七、實(shí)驗(yàn)收獲與心得體會(huì)........................................................................................................11 實(shí)驗(yàn)八可編程定時(shí)器／計(jì)數(shù)器（8253/8254）.........................................................................11一、實(shí)驗(yàn)?zāi)康?..............................................................................................................................11二、實(shí)驗(yàn)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(shí)驗(yàn)結(jié)果...............................................................................................................................17六、實(shí)驗(yàn)總結(jié)與思考題............................................................................................................17七、實(shí)驗(yàn)收獲與心得體會(huì)........................................................................................................17 實(shí)驗(yàn)十六串行通訊8251....................................................................................................................18一、實(shí)驗(yàn)?zāi)康?..............................................................................................................................18二、實(shí)驗(yàn)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(shí)驗(yàn)結(jié)果...............................................................................................................................22六、實(shí)驗(yàn)總結(jié)與思考題............................................................................................................22七、實(shí)驗(yàn)收獲與心得體會(huì)...........................................