弟入井出（74弟以4）酒井大率也（74LS堀）\我們?cè)谶M(jìn)行數(shù)據(jù)轉(zhuǎn)換的時(shí)候經(jīng)常會(huì)用到74LS164,74LS165,在單片機(jī)課程和數(shù)字電子基礎(chǔ)里都可以看到，這兩個(gè)芯片是思緒上要形成互補(bǔ)的思想，一個(gè)是串入并出，另外一個(gè)是并入串出！一下兩個(gè)例題用到的是單片機(jī)的串行線，TXD（發(fā)送標(biāo)志是TI）和RXD（接收標(biāo)志是RI）串行數(shù)據(jù)轉(zhuǎn)換為并行數(shù)據(jù)（741S164串入并出）--U2D7DC31.0uFRX-10k'P1.7P3.7/RCTP1.6P3.6/WRP1.5P3.5/T1P1.4P3.4/T0P1.3P3.3/1NT1P1.2P3.2/1NT0P1.1P3.1JTXDP1.0P3.0/RXDP2.7/A15P2.6/A14EAP2.5/A13ALEP2.4/A12PSENP2.3/A11P2.2/A10P2.1/A9P2.0/A8RSTP0.7/AD7P0.6/AD6P0.5/AD5P0.4/AD4XTAL2--U2D7DC31.0uFRX-10k'P1.7P3.7/RCTP1.6P3.6/WRP1.5P3.5/T1P1.4P3.4/T0P1.3P3.3/1NT1P1.2P3.2/1NT0P1.1P3.1JTXDP1.0P3.0/RXDP2.7/A15P2.6/A14EAP2.5/A13ALEP2.4/A12PSENP2.3/A11P2.2/A10P2.1/A9P2.0/A8RSTP0.7/AD7P0.6/AD6P0.5/AD5P0.4/AD4XTAL2P0.3/AD3P0.2/AD2P0.1/AD1>XTAL1P0.0/AD0IF；IP220_2￡l'_2i._2i.D6R3D5R4R5D3-R6-220D2R7R874164D4.口.--ui3、oSRG8n.>C：1/->R2220220220.5.22025022pF AT8!dC：5l/*名稱：串行數(shù)據(jù)轉(zhuǎn)換為并行數(shù)據(jù)說(shuō)明：串行數(shù)據(jù)由RXD發(fā)送給串并轉(zhuǎn)換芯片74164，TXD則用于輸出移位時(shí)鐘脈沖，74164將串行輸入的1字節(jié)轉(zhuǎn)換為并行數(shù)據(jù)，并將轉(zhuǎn)換的數(shù)據(jù)通過(guò)8只LED顯示出來(lái)。本例串口工作模式0,即移位寄存器I/O模式。TXD發(fā)送*/#include<reg51.h>#include<intrins.h>#defineucharunsignedchar#defineuintunsignedint〃延時(shí)voidDelayMS(uintms){uchari;while(ms--)for(i=0;i<120;i++);}〃主程序voidmain(){ucharc=0x80;SCON=0x00;〃串口模式0，即移位寄存器輸入/輸出方式TI=1;while(1){c=_crol_(c,1);SBUF=c;while(TI==0); //等待發(fā)送結(jié)束TI=0; //TI軟件置位DelayMS(400);}}實(shí)驗(yàn)結(jié)果：我們要送的數(shù)是0x80，串行方式0是移位寄存器輸入輸出方式。_crol_（）在#include<intrins.h>fi，是左移函數(shù)。把這數(shù)每一位放在C里，TXD進(jìn)行發(fā)送，也就是產(chǎn)生移位脈沖。

每來(lái)一次下降沿，數(shù)據(jù)就發(fā)送一次!并行數(shù)據(jù)轉(zhuǎn)換為串行數(shù)據(jù)(并入串出741S165)A10k.C3..flI-■■1LILjF-.武八1 1ru.u^uuP0.1/AD1P0.2/AD2XTAL2P0.3/AD3PLI.4/AD4P0.5/AD5P0.6/AD6RSTP0.7/AD7A10k.C3..flI-■■1LILjF-.武八1 1ru.u^uuP0.1/AD1P0.2/AD2XTAL2P0.3/AD3PLI.4/AD4P0.5/AD5P0.6/AD6RSTP0.7/AD7P2.0/A8P2.1/A9P2.2/A10PSENP2.3/A11ALEP2.4/A12EAP2.5/A13P2.6/A14P2.7/A15PI.0P3.0/RXDFl.1FJ.1/IXDPI.2P3.2WT0PI.3P3.3MNT1PI.4P3.4.'T0PI.5P3.5/T1PI.6P3.6yWRPI.7P37/RDATS9C51IIOFFSH.'iFINH<CLIOSOD7D6D5D4D3D2DIDOSI—OSPL.74LS165-^■0汛4&14'虹13-3'-122-,?11丁- 9TX：：!/*名稱：并行數(shù)據(jù)轉(zhuǎn)換為串行數(shù)據(jù)說(shuō)明：切換連接到并串轉(zhuǎn)換芯片74LS165的撥碼開(kāi)關(guān)，該芯片將并行數(shù)據(jù)以串行方式發(fā)送到8051的RXD引腳，移位脈沖由TXD提供，顯示在P0口。RXD接收*/#include<reg51.h>#include<intrins.h>#include<stdio.h>#defineucharunsignedchar#defineuintunsignedintsbitSPL=P2A5; //shift/load〃延時(shí)voidDelayMS(uintms){uchari;while(ms--)for(i=0;i<120;i++);}〃主程序voidmain(){SCON=0x10;〃串口模式0,允許串口接收while(1){SPL=0; 〃置數(shù)(load)，讀入并行輸入口的8位數(shù)據(jù)SPL=1; 〃移位(shift)，并口輸入被封鎖，串行轉(zhuǎn)換開(kāi)始while(RI==0);〃未接收1字節(jié)時(shí)等待RI=0; //RI軟件置位P0=SBUF; 〃接收到的數(shù)據(jù)顯示在P0口，顯示撥碼開(kāi)關(guān)的值DelayMS(20);}}與74LS164的工作原理大致相同，這個(gè)這是接收，用LED來(lái)顯示八個(gè)開(kāi)關(guān)的狀態(tài)。很簡(jiǎn)單的。注意這個(gè)