《微机原理与接口技术》实训程序代码

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1、实训1排序程序设计六．参考代码DATASEGMENTDW0055H，0033H,0066H,0077H,0099H,0011H,0022H,0088H,0044H,0000HDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMOVCX,9LOOP1:MOVDX,CXMOVBX,0LOOP2:MOVAX,[BX]INCBXINCBXCMPAX,[BX]JLEDONE；小于或等于转移XCHG[BX],AXDECBXDECBXMOV[BX],AXINC

2、BXINCBXDONE:DECDXJNELOOP2LOOPLOOP1MOVAX,4C00HINT21HCODEENDSENDSTART实训二8259A外部中断六．参考代码CS273equ8000HICW1euq00010011b;单片8259,上升沿触发中断,写ICW4 ICW2equ00100000b;中断号为20H ICW4equ00000001b;工作在8086/88方式 OCW1equ11111110b;只响应IR0 CS8259Aequ0A000h CS8259Bequ0A001hdatasegmentCNTdb

3、0dataendscodesegmentasummecs:code,ds:dtaienterprocnearpushaxpushdxmovdx,CS273incCNTmoval,CNToutdx,al；输出计数值movdx,CS8259Amoval,20houtdx,alpopdxpopaxiretienterendpiinitprocmovdx,CS8259Amoval,ICW1outdx,almovdx,CS8259Bmoval,ICW2outdx,almoval,ICW4outdx,almoval,OCW1outdx

4、,alretiinitendpstartprocnearclimovax,0movds,axmovbx,4*ICW2movax,code;movax,offsetienter；中断入口地址（段地址为0）mov[bx],axmovax,0incbxincbxmov[bx],ax；代码段地址为0calliinitmovax,datamovds,axmovCNT,0；计数初值为0moval,CNTmovdx,CS273outdx,alstiLP:nop；等待中断jmpLPstartendpcodeendsendstart实训三8

5、255输入/输出七．参考代码modeequ082h;方式0，PA，PC输出，PB输入 PortAequ8000h;PortA PortBequ8001h;PortBPortCequ8002h;PortCCAddrequ8003h;控制字地址codesegmentassumecs:codestartprocnearStart:moval,modemovdx,CAddroutdx,al;输出控制字moval,80Hmovcx,08HOutA:movdx,PortAoutdx,al;输出PortAmovdx,PortCoutdx

6、,alshral,1;移位movah,100calldelay;延时loopOutAdelayprocnearpushaxmoval,0pushcxmovcx,axloop$popcxpopaxretdelayendpcodeendsenfstart实训48251A串行通讯七．参考代码CS8251Dequ8000h；8251控制口地址CS8251Cequ8001hdatasegmentsourcedb256dup(055h)targetdb256dup(0aah)RBufdb0TBufdb0dataendscodesegm

7、entassumecs:code,ds:dataIInitprocnear；8251初始化movdx,CS8251Cmoval,01001111b；1位停止位，无校验，8位数据，波特率因子64outdx,almoval,00010101b；清除错标志，允许发送接收retIInitendpsendprocnear；串口发送movdx,CS8251Cmoval,00010101boutdx,alWaitTXD:inal,dxtestal,1；发送缓冲器是否为空jzWaitTXDmoval,TBuf；取要发送的字movdx,CS

8、8251Doutdx,al；发送数据retsendendpreceiveprocnear；串行接收movdx,CS8251CWaitRXD:inal,dxtestal,2；是否已收到一个字jeWaitRXDmovdx,CS8251Dinal,dx；读取接收的字movRBuf,alretreceiveen