第10頁共10頁實驗七串行通信實驗一、實驗目的掌握實現串行通信的基本方法；掌握鍵盤按鍵控制的串行通信實現方法； 掌握定時控制的串行通信實現方法。根據已知電路和設計要求在PROTEUS平臺仿真實現通信系統。INC78HEND2:MOVA,76HCJNEA,78H,RETNMOVA,75HCJNEA,77H,RETNCLRESCLREASETB7FHSJMPRETN五、實驗過程中遇到的主要問題equ08002h;位控制口equ08004h;段控制口equ08001h;鍵盤讀入口20h.0;接收標志位40h;顯示緩沖50H;接收緩沖ORG0000H;串行口中斷程序ORG0023HJNBTI,S0_RCLRTINOPS0_RETS0_R:;接收數據CLRRI;保存數據HasRcv;提示收到數據NOPRETILEDMAP:;八段管顯示碼db3fh,06h,5bh,4fh,66h,6dh,7dh,07hdb7fh,6fh,77h,7ch,39h,5eh,79h,71h;延時子程序movr7,#0DelayLoop:djnzr7,DelayLoopdjnzr6,DelayLoopretDisplayLED:movr0,#LEDBufmovr1,#6;共6個八段管movr2,#00100000b;從左邊開始顯示Loop:movdptr,#OUTBITmova,#0movx@dptr,a;關所有八段管mova,@r0movdptr,#OUTSEGmovxmovdptr,#OUTBITmova,r2movx@dptr,a;顯示一位八段管movr6,#1Delaymov;顯示下一位rramovr2,aincr0djnzr1,Loopretmovdptr,#OUTBITmova,#0movx;輸出線置為0movmovx;讀入鍵狀態cplaanl;高四位不用ret;鍵碼定義db16h,15h,14h,0ffhdbdb0dh,0ch,0bh,0ahdb0eh,03h,06h,09hdb0fh,02h,05h,08hdb00h,01h,04h,07hGetKey:movmovP2,dphmovr0,#Low(IN)movr1,#00100000bmovr2,#6KLoop:mova,r1;找出鍵所在列cplamovxcplaamovr1,a;下一列movxa,@r0cplaanla,#0fhjnzGoon1;該列有鍵入djnzr2,KLoopmov;沒有鍵按下,返回sjmpExitGoon1:movr1,a;鍵值列行mova,r2arlarlamovr2,a;r2=(r2-1)*4mova,r1;r1中為讀入的行值movr1,#4LoopC:rrc;移位找出所在行jcExitincr2行值djnzr1,LoopCmova,r2;取出鍵碼movmovca,@a+dptrmovr2,amov;等鍵釋放amovxmovr6,#10callDelaycalljnzmova,r2retMOV#60HMOV#0;DISABLEALLINTERRUPTMOVTMOD,#020H;定時器1工作于方式2(8位重裝MOVTH1,#0F3H;波特率?2400BPS@12MHzMOVTL1,#0F3HPCON,#07FH;SMOD位清零PCON,#80hMOVSCON,#050H;串行口工作方式設置MOV;顯示8.8.8.8.movLEDBuf+1,#0ffhmovLEDBuf+2,#0ffhmovmovLEDBuf+4,#0movLEDBuf+5,#0SETBTR1SETBESSETBEA;movsbuf,a;jnbti,$MLoop:jb;收到數據？callDisplayLED;顯示call;有鍵入?jzMLoop;無鍵入,繼續顯示call;讀入鍵碼anla,#0fh;通訊口輸出鍵碼MLoopRcvData:clrHasRcv;是mova,RcvBuf;顯示數據movb,aanla,#0fh;顯示低位movdptr,#LEDMapmovca,@a+dptrmovL