1、實(shí)驗(yàn)四 兩個(gè)單片機(jī)之間雙向通信實(shí)驗(yàn)一、實(shí)驗(yàn)?zāi)康?1.了解MCS-51單片機(jī)串行口（UART）的結(jié)構(gòu)、工作方式。 2.了解串行口通信的原理和數(shù)據(jù)交換過程。 3.掌握單片機(jī)之間進(jìn)行串行口通信的編程方法。二、實(shí)驗(yàn)內(nèi)容 將甲乙兩臺(tái)單片機(jī)串行口連接，即甲機(jī)的TXD與乙機(jī)的RXD相連；甲機(jī)的RXD與乙機(jī)的TXD相連；并實(shí)現(xiàn)雙機(jī)共地。整個(gè)系統(tǒng)實(shí)現(xiàn)雙向通信。具體是:1.甲機(jī)的K1按鍵可通過串行口分別控制乙機(jī)的LED1點(diǎn)亮；LED2點(diǎn)亮；LED1和LED2全亮或者全滅。2.乙機(jī)的K2按鍵可通過串行口向甲機(jī)發(fā)送數(shù)字，甲機(jī)將接收到的數(shù)字顯示在其P0端口的LED數(shù)碼管顯示器上。三、實(shí)驗(yàn)程序甲機(jī)程序： ORG0000H

2、 AJMPMAIN ORG0003H AJMPSEND ORG0023H AJMPREADYMAIN:MOVSCON,#90HMOVPCON,#80HSETBEASETBESSETBIT0SETBEX0MOVSP,#40HMOVR0,#0MOVDPTR,#TABHERE:SJMPHERESEND:CJNER0,#04H,LP1SHOW: MOV A,R0 MOV CA,A+DPTR MOV C,P MOV TB8,C MOV SBUF,A CLR TI INCR0 RETIREADY:JBCTI,RETURNRECEIVE:CLRRI MOVA,SBUF MOVP0,ARETURN:RETIL

3、P1:JCSHOWCLRCMOVA,R0SUBBA,#04HMOVR0,AAJMPSHOWTAB:DB00H,01H,02H,03HEND乙機(jī)程序：ORG0000HAJMPMAINORG0003HAJMPSENDORG0023HAJMPREADYMAIN:MOVSCON,#90H MOVPCON,#80H SETBEA SETBES SETBIT0 SETBEX0MOVSP,#40HMOVR0,#0MOVDPTR,#TABHERE:SJMPHERESEND:CJNER0,#09H,LP1SHOW: MOV A,R0 MOV CA,A+DPTR MOV C,P MOV TB8,C MOV SBUF,A CLR TI INC R0 RETIREADY:JBCTI,RETURNRECEIVE:CLRRI MOVA,SBUF MOVP1,ARETURN:RETILP1:JCSHOW CLRC MOVA,R0 SUBBA,#0AHMOVR0,AAJMPSHOWTAB:DB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFHEND四、實(shí)驗(yàn)原理圖五、實(shí)驗(yàn)仿真及結(jié)果六、實(shí)驗(yàn)總結(jié)通過本次實(shí)驗(yàn)，掌握了單片機(jī)之間進(jìn)行串行口通信的編程方法，對(duì)