51單片機(jī)入門(mén)實(shí)例

1、動(dòng)態(tài)數(shù)碼顯示技術(shù)144X4矩陣式鍵盤(pán)識(shí)別技術(shù)15.定時(shí)計(jì)數(shù)器T0作定時(shí)應(yīng)用技術(shù)（一）13.動(dòng)態(tài)數(shù)碼顯示技術(shù)實(shí)驗(yàn)任務(wù)如圖4.13.1所示，P0端口接動(dòng)態(tài)數(shù)碼管的字形碼筆段，P2端口接動(dòng)態(tài)數(shù)碼管的數(shù)位選擇端，P1.7接一個(gè)開(kāi)關(guān)，當(dāng)開(kāi)關(guān)接高電平時(shí)，顯示“12345”字樣；當(dāng)開(kāi)關(guān)接低電平時(shí)，顯示“HELLO字樣。電路原理圖=36誠(chéng)sdsk宜LdgagEEowcgC誓£弓=s_長(zhǎng)總號(hào)EdIM2,'lulsEd口-Qi/D.HZjI*scJiCc口cJQco801£3O:Jr.iQ3F5U-:-z-"l-L-g*1kr«-rA1VCCr_cOTE-47K圖4

2、.13.11. 系統(tǒng)板上硬件連線(1.把“單片機(jī)系統(tǒng)”區(qū)域中的P0.0/AD0P0.7/AD7用8芯排線連接到“動(dòng)態(tài)數(shù)碼顯示”區(qū)域中的ah端口上；(2.把“單片機(jī)系統(tǒng)”區(qū)域中的P2.0/A8P2.7/A15用8芯排線連接到“動(dòng)態(tài)數(shù)碼顯示”區(qū)域中的S1S8端口上；(3.把“單片機(jī)系統(tǒng)”區(qū)域中的P1.7端口用導(dǎo)線連接到“獨(dú)立式鍵盤(pán)”區(qū)域中的SP1端口上；程序設(shè)計(jì)內(nèi)容(1.動(dòng)態(tài)掃描方法動(dòng)態(tài)接口采用各數(shù)碼管循環(huán)輪流顯示的方法，當(dāng)循環(huán)顯示頻率較高時(shí)，利用人眼的暫留特性，看不出閃爍顯示現(xiàn)象，這種顯示需要一個(gè)接口完成字形碼的輸出（字形選擇），另一接口完成各數(shù)碼管的輪流點(diǎn)亮（數(shù)位選擇）。（2.在進(jìn)行數(shù)碼顯示的

3、時(shí)候，要對(duì)顯示單元開(kāi)辟8個(gè)顯示緩沖區(qū)，每個(gè)顯示緩沖區(qū)裝有顯示的不同數(shù)據(jù)即可。（3.對(duì)丁顯示的字形碼數(shù)據(jù)我們采用查表方法來(lái)完成。程序框圖圖4.13.2匯編源程序ORG00HSTART:JBP1.7,DIR1MOVDPTR,#TABLE1SJMPDIRDIR1:MOVDPTR,#TABLE2DIR:MOVR0,#00HMOVR1,#01HNEXT:MOVA,R0MOVCA,A+DPTRMOVP0,AMOVA,R1MOVP2,ALCALLDAYINCR0RLAMOVR1,ACJNER1,#0DFH,NEXTSJMPSTARTDAY:MOVR6,#4D1:MOVR7,#248DJNZR7,$DJNZR

4、6,D1RETTABLE1:DB06H,5BH,4FH,66H,6DHTABLE2:DB78H,79H,38H,38H,3FHENDC語(yǔ)言源程序#include<AT89X51.H>unsignedcharcodetable1=0x06,0x5b,0x4f,0x66,0x6d;unsignedcharcodetable2=0x78,0x79,0x38,0x38,0x3f;unsignedchari;unsignedchara,b;unsignedchartemp;voidmain(void)while(1)temp=0xfe;for(i=0;i<5;i+)if(P1_7=1)

5、P0=table1i;elseP0=table2i;P2=temp;a=temp<<(i+1);b=temp>>(7-i);temp=a|b;for(a=4;a>0;a-)for(b=248;b>0;b-);4X4矩陣式鍵盤(pán)識(shí)別技術(shù)1.實(shí)驗(yàn)任務(wù)如圖4.14.2所示，用AT89S51的并行口P1接4X4矩陣鍵盤(pán)，以P1.0P1.3作輸入線，以P1.4P1.7作輸出線；在數(shù)碼管上顯示每個(gè)按鍵的“0F”序號(hào)。對(duì)應(yīng)的按鍵的序號(hào)排列如圖4.14.1所示圖4.14.12.硬件電路原理圖F1U"B-F->'1-1T-*:歸b“3R一邑丈W自

6、7;54M屋t?r.生mwuLE-Kmu官"iwf。一yw5ESmgst與受理IEsN昌£料一WKs耳ma急圖4.14.23.系統(tǒng)板上硬件連線(1.把“單片機(jī)系統(tǒng)“區(qū)域中的P3.0P3.7端口用8芯排線連接到“4X4行列式鍵盤(pán)”區(qū)域中的C1C4R1-R4端口上；(2.把“單片機(jī)系統(tǒng)”區(qū)域中的P0.0/AD0P0.7/AD7端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a-h端口上；要求：P0.0/AD0對(duì)應(yīng)著a,P0.1/AD1對(duì)應(yīng)著b,，P0.7/AD7對(duì)應(yīng)著h。4.程序設(shè)計(jì)內(nèi)容(1.4X4矩陣鍵盤(pán)識(shí)別處理(2.每個(gè)按鍵有它的行值和列值，行值和列值的組合就是識(shí)

7、別這個(gè)按鍵的編碼。矩陣的行線和列線分別通過(guò)兩并行接口和CPU!信。每個(gè)按鍵的狀態(tài)同樣需變成數(shù)字量“0”和“1”，開(kāi)關(guān)的一端(列線)通過(guò)電阻接VCC而接地是通過(guò)程序輸出數(shù)字“0”實(shí)現(xiàn)的。鍵盤(pán)處理程序的任務(wù)是：確定有無(wú)鍵按下，判斷哪一個(gè)鍵按下，鍵的功能是什么；還要消除按鍵在閉合或斷開(kāi)時(shí)的抖動(dòng)。兩個(gè)并行口中，一個(gè)輸出掃描碼，使按鍵逐行動(dòng)態(tài)接地，另一個(gè)并行口輸入按鍵狀態(tài)，由行掃描值和回饋信號(hào)共同形成鍵編碼而識(shí)別按鍵，通過(guò)軟件查表，查出該鍵的功能。5.程序框圖有鍵搜下嗎?P3-FFH件=0延時(shí)lOtng真得有鍵按下嗎?圖4.14.36.匯編源程序KEYBUFEQU30HORG00HSTART:MOVKE

8、YBUF,#2WAIT:MOVP3,#0FFHCLRP3.4MOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY1LCALLDELY10MSMOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY1MOVA,P3ANLA,#0FHCJNEA,#0EH,NK1MOVKEYBUF,#0LJMPDK1NK1:CJNEA,#0DH,NK2MOVKEYBUF,#1LJMPDK1NK2:CJNEA,#0BH,NK3MOVKEYBUF,#2LJMPDK1NK3:CJNEA,#07H,NK4MOVKEYBUF,#3LJMPDK1NK4:NOPDK1:MOVA,KEYBUFMOVDPTR,#

9、TABLEMOVCA,A+DPTRMOVP0,ADK1A:MOVA,P3ANLA,#0FHXRLA,#0FHJNZDK1ANOKEY1:MOVP3,#0FFHCLRP3.5MOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY2LCALLDELY10MSMOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY2MOVA,P3ANLA,#0FHCJNEA,#0EH,NK5MOVKEYBUF,#4LJMPDK2NK5:CJNEA,#0DH,NK6MOVKEYBUF,#5LJMPDK2NK6:CJNEA,#0BH,NK7MOVKEYBUF,#6LJMPDK2NK7:CJNEA,#0

10、7H,NK8MOVKEYBUF,#7LJMPDK2NK8:NOPDK2:MOVA,KEYBUFMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,ADK2A:MOVA,P3ANLA,#0FHXRLA,#0FHJNZDK2ANOKEY2:MOVP3,#0FFHCLRP3.6MOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY3LCALLDELY10MSMOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY3MOVA,P3ANLA,#0FHCJNEA,#0EH,NK9MOVKEYBUF,#8LJMPDK3NK9:CJNEA,#0DH,NK10MOVKEYBUF,#

11、9LJMPDK3NK10:CJNEA,#0BH,NK11MOVKEYBUF,#10LJMPDK3NK11:CJNEA,#07H,NK12MOVKEYBUF,#11LJMPDK3NK12:NOPDK3:MOVA,KEYBUFMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,ADK3A:MOVA,P3ANLA,#0FHXRLA,#0FHJNZDK3ANOKEY3:MOVP3,#0FFHCLRP3.7MOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY4LCALLDELY10MSMOVA,P3ANLA,#0FHXRLA,#0FHJZNOKEY4MOVA,P3ANLA,#0F

12、HCJNEA,#0EH,NK13MOVKEYBUF,#12LJMPDK4NK13:CJNEA,#0DH,NK14MOVKEYBUF,#13LJMPDK4NK14:CJNEA,#0BH,NK15MOVKEYBUF,#14LJMPDK4NK15:CJNEA,#07H,NK16MOVKEYBUF,#15LJMPDK4NK16:NOPDK4:MOVA,KEYBUFMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,ADK4A:MOVA,P3ANLA,#0FHXRLA,#0FHJNZDK4ANOKEY4:LJMPWAITDELY10MS:MOVR6,#10D1:MOVR7,#248DJNZR

13、7,$DJNZR6,D1RETTABLE:DB3FH,06H,5BH,4FH,66H,6DH,7DH,07HDB7FH,6FH,77H,7CH,39H,5EH,79H,71HEND7.C語(yǔ)言源程序#include<AT89X51.H>unsignedcharcodetable=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;unsignedchartemp;unsignedcharkey;unsignedchari,j;voidmain(void)(while(1)(P3

14、=0xff;P3_4=0;temp=P3;temp=temp&0x0f;if(temp!=0x0f)(for(i=50;i>0;i-)for(j=200;j>0;j-);temp=P3;temp=temp&0x0f;if(temp!=0x0f)(temp=P3;temp=temp&0x0f;switch(temp)(case0x0e:key=7;break;case0x0d:key=8;break;case0x0b:key=9;break;case0x07:key=10;break;temp=P3;P1_0=P1_0;P0=tablekey;temp=tem

15、p&0x0f;while(temp!=0x0f)(temp=P3;temp=temp&0x0f;P3=0xff;P3_5=0;temp=P3;temp=temp&0x0f;if(temp!=0x0f)(for(i=50;i>0;i-)for(j=200;j>0;j-);temp=P3;temp=temp&0x0f;if(temp!=0x0f)(temp=P3;temp=temp&0x0f;switch(temp)(case0x0e:key=4;break;case0x0d:key=5;break;case0x0b:key=6;break;ca

16、se0x07:key=11;break;temp=P3;P1_0=P1_0;P0=tablekey;temp=temp&0x0f;while(temp!=0x0f)(temp=P3;temp=temp&0x0f;P3=0xff;P3_6=0;temp=P3;temp=temp&0x0f;if(temp!=0x0f)(for(i=50;i>0;i-)for(j=200;j>0;j-);temp=P3;temp=temp&0x0f;if(temp!=0x0f)(temp=P3;temp=temp&0x0f;switch(temp)(case0x0

17、e:key=1;break;case0x0d:key=2;break;case0x0b:key=3;break;case0x07:key=12;break;temp=P3;P1_0=P1_0;P0=tablekey;temp=temp&0x0f;while(temp!=0x0f)(temp=P3;temp=temp&0x0f;P3=0xff;P3_7=0;temp=P3;temp=temp&0x0f;if(temp!=0x0f)(for(i=50;i>0;i-)for(j=200;j>0;j-);temp=P3;temp=temp&0x0f;if(t

18、emp!=0x0f)(temp=P3;temp=temp&0x0f;switch(temp)(case0x0e:key=0;break;case0x0d:key=13;break;case0x0b:key=14;break;case0x07:key=15;break;temp=P3;P1_0=P1_0;P0=tablekey;temp=temp&0x0f;while(temp!=0x0f)(temp=P3;temp=temp&0x0f;15.定時(shí)計(jì)數(shù)器T0作定時(shí)應(yīng)用技術(shù)（一）實(shí)驗(yàn)任務(wù)用AT89S51單片機(jī)的定時(shí)/計(jì)數(shù)器T0產(chǎn)生一秒的定時(shí)時(shí)間，作為秒計(jì)數(shù)時(shí)間，當(dāng)一秒產(chǎn)生時(shí)

19、，秒計(jì)數(shù)加1,秒計(jì)數(shù)到60時(shí)，自動(dòng)從0開(kāi)始。硬件電路如下圖所示電路原理圖F3nfRXDFJLE8P33WTTrsyriJSEtWaP37®DI-臣cLrl345必.7plvlFrIplFip1F112POLACOPOkadiPQJVAI2F03TAE3Ml4ME4POWaDSPO-fi/AMPD_?/Ar?7ALEF2：了心孕巳：5由】4P/3值門(mén)P±3心IU1»沖POlRTO:=I3MH<=iCMP20/AK2；：'-gXo'電總mw闋W88%P2iP2PKi?PJ!&IP23FIz圖4.15.11. 系統(tǒng)板上硬件連線(1.把“單片

20、機(jī)系統(tǒng)”區(qū)域中的P0.0/AD0P0.7/AD7端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a-h端口上；要求：P0.0/AD0對(duì)應(yīng)著a,P0.1/AD1對(duì)應(yīng)著b,，P0.7/AD7對(duì)應(yīng)著h。(2.把“單片機(jī)系統(tǒng)”區(qū)域中的P2.0/A8P2.7/A15端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a-h端口上；要求：P2.0/A8對(duì)應(yīng)著a,P2.1/A9對(duì)應(yīng)著b,，P2.7/A15對(duì)應(yīng)著h。2. 程序設(shè)計(jì)內(nèi)容AT89S51單片機(jī)的內(nèi)部16位定時(shí)/計(jì)數(shù)器是一個(gè)可編程定時(shí)/計(jì)數(shù)器，它既可以工作在13位定時(shí)方式，也可以工作在16位定時(shí)方式和8位定時(shí)方式。只要通過(guò)設(shè)置特殊功能

21、寄存器TMOD即可完成。定時(shí)/計(jì)數(shù)器何時(shí)工作也是通過(guò)軟件來(lái)設(shè)定TCOF#殊功能寄存器來(lái)完成的?，F(xiàn)在我們選擇16位定時(shí)工作方式，對(duì)丁T0來(lái)說(shuō)，最大定時(shí)也只有65536us,即65.536ms,無(wú)法達(dá)到我們所需要的1秒的定時(shí)，因此，我們必須通過(guò)軟件來(lái)處理這個(gè)問(wèn)題，假設(shè)我們?nèi)0的最大定時(shí)為50m§即要定時(shí)1秒需要經(jīng)過(guò)20次的50ms的定時(shí)。對(duì)丁這20次我們就可以采用軟件的方法來(lái)統(tǒng)計(jì)了。因此，我們?cè)O(shè)定TMOD00000001己即TMOD01H下面我們要給T0定時(shí)/計(jì)數(shù)器的THQTL0裝入預(yù)置初值，通過(guò)下面的公式可以計(jì)算出THk(21650000)/256TL0=(21650000)MOD2

22、56當(dāng)T0在工作的時(shí)候，我們?nèi)绾蔚弥?0ms的定時(shí)時(shí)間已到，這回我們通過(guò)檢測(cè)TCOF#殊功能寄存器中的TF0標(biāo)志位，如果TF0=1表示定時(shí)時(shí)間已到。程序框圖(開(kāi)始、L_4-一二一L:皿產(chǎn)、個(gè)*飛財(cái)§f蜜r.肖.awwIWLiTH。，TLO轄入初1伯<TFC=1W圖4.15.2匯編源程序（查詢法）SECONDEQU30HTCOUNTEQU31HORG00HSTART:MOVSECOND,#00HMOVTCOUNT,#00HMOVTMOD,#01HMOVTH0,#(65536-50000)/256MOVTL0,#(65536-50000)MOD256SETBTR0DISP:MOVA

23、,SECONDMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVCA,A+DPTRMOVP2,AWAIT:JNBTF0,WAITCLRTF0MOVTH0,#(65536-50000)/256MOVTL0,#(65536-50000)MOD256INCTCOUNTMOVA,TCOUNTCJNEA,#20,NEXTMOVTCOUNT,#00HINCSECONDMOVA,SECONDCJNEA,#60,NEXMOVSECOND,#00HNEX:LJMPDISPNEXT:LJMPWAITTABLE:DB3FH,06H,5BH,4FH,66H,

24、6DH,7DH,07H,7FH,6FHENDC語(yǔ)言源程序(查詢法)#include<AT89X51.H>unsignedcharcodedispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00;unsignedcharsecond;unsignedchartcount;voidmain(void)TMOD=0x01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;TR0=1;tcount=0;second=0;P0

25、=dispcodesecond/10;P2=dispcodesecond%10;while(1)if(TF0=1)tcount+;if(tcount=20)tcount=0;second+;if(second=60)second=0;P0=dispcodesecond/10;P2=dispcodesecond%10;TF0=0;TH0=(65536-50000)/256;TL0=(65536-50000)%256;匯編源程序(中斷法)SECONDEQU30HTCOUNTEQU31HORG00HLJMPSTARTORG0BHLJMPINT0XSTART:MOVSECOND,#00HMOVA,SE

26、CONDMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVCA,A+DPTRMOVP2,AMOVTCOUNT,#00HMOVTMOD,#01HMOVTH0,#(65536-50000)/256MOVTL0,#(65536-50000)MOD256SETBTR0SETBET0SETBEASJMP$INT0X:MOVTH0,#(65536-50000)/256MOVTL0,#(65536-50000)MOD256INCTCOUNTMOVA,TCOUNTCJNEA,#20,NEXTMOVTCOUNT,#00HINCSECONDMOVA,SE

27、CONDCJNEA,#60,NEXMOVSECOND,#00HNEX:MOVA,SECONDMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVCA,A+DPTRMOVP2,ANEXT:RETITABLE:DB3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FHENDC語(yǔ)言源程序(中斷法)#include<AT89X51.H>unsignedcharcodedispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x3

28、9,0x5e,0x79,0x71,0x00;unsignedcharsecond;unsignedchartcount;voidmain(void)(TMOD=0x01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;TR0=1;ET0=1;EA=1;tcount=0;second=0;P0=dispcodesecond/10;P2=dispcodesecond%10;while(1);voidt0(void)interrupt1using0(tcount+;if(tcount=20)(tcount=0;second+;if(second=60)(sec

29、ond=0;P0=dispcodesecond/10;P2=dispcodesecond%10;TH0=(65536-50000)/256;TL0=(65536-50000)%256;16.定時(shí)計(jì)數(shù)器T0作定時(shí)應(yīng)用技術(shù)（二）1.實(shí)驗(yàn)任務(wù)用AT89S51的定時(shí)/計(jì)數(shù)器T0產(chǎn)生2秒鐘的定時(shí)，每當(dāng)2秒定時(shí)到來(lái)時(shí)，更換指示燈閃爍，每個(gè)指示閃爍的頻率為0.2秒，也就是說(shuō)，開(kāi)始L1指示燈以0.2秒的速率閃爍，當(dāng)2秒定時(shí)到來(lái)之后，L2開(kāi)始以0.2秒的速率閃爍，如此循環(huán)下去。0.2秒的閃爍速率也由定時(shí)/計(jì)數(shù)器T0來(lái)完成。2.電路原理圖VC!CL14度1Z17岳ouP1POO/ADOFl1POl/ADlP1.2

30、FO2/AD2P13PO3MD3F14FO4/AD4F15IF口g口SF：GFOEftgT>17POT/AWALEPSIJJTLXOF2/7/A15P31/TJCDP2.*7A14P3.2/INTOPZ.5/A1JP33/1HT1F34fT0P23XA11F3smP22/A1OP3.6/WRF2l/ASP2C7AS共只昌04寸6jT|廠DO363736355433323G29282?26恐242322Z1C2=叫FMHC33OpF圖4.16.1系統(tǒng)板硬件連線(1.把“單片機(jī)系統(tǒng)”區(qū)域中的P1.0P1.3用導(dǎo)線連接到“八路發(fā)光二極管指示模塊”區(qū)域中的L1-L4上程序設(shè)計(jì)內(nèi)容(1.由丁采用中

31、斷方式來(lái)完成，因此，對(duì)丁中斷源必須它的中斷入口地址，對(duì)丁定時(shí)/計(jì)數(shù)器T0來(lái)說(shuō)，中斷入口地址為000BH因此在中斷入口地方加入長(zhǎng)跳轉(zhuǎn)指令來(lái)執(zhí)行中斷服務(wù)程序。書(shū)寫(xiě)匯編源程序格式如下所示：ORG00HLJMPSTARTORG0BH;定時(shí)/計(jì)數(shù)器T0中斷入口地址LJMPINT_T0START:NOP;主程序開(kāi)始INT_T0:PUSHACC;定時(shí)/計(jì)數(shù)器T0中斷服務(wù)程序PUSHPSWPOPPSWPOPACCRETI;中斷服務(wù)程序返回END(2.定時(shí)2秒，采用16位定時(shí)50ms共定時(shí)40次才可達(dá)到2秒，每50ms產(chǎn)生一中斷，定時(shí)的40次數(shù)在中斷服務(wù)程序中完成，同樣0.2秒的定時(shí)，需要4次才可達(dá)到0.2秒。

32、對(duì)丁中斷程序，在主程序中要對(duì)中斷開(kāi)中斷。(3.由丁每次2秒定時(shí)到時(shí)，L1-L4要交替閃爍。采用ID來(lái)號(hào)來(lái)識(shí)別。當(dāng)ID=0時(shí)，L1在閃爍，當(dāng)ID=1時(shí)，L2在閃爍；當(dāng)ID=2時(shí)，L3在閃爍；當(dāng)ID=3時(shí)，L4在閃爍程序框圖T0中斷服務(wù)程序框圖主程序框圖圖4.16.2匯編源程序TCOUNT2SEQU30HTCNT02SEQU31HIDEQU32HORG00HLJMPSTARTORG0BHLJMPINT_T0START:MOVTCOUNT2S,#00HMOVTCNT02S,#00HMOVID,#00HMOVTMOD,#01HMOVTH0,#(65536-50000)/256MOVTL0,#(6553

33、6-50000)MOD256SETBTR0SETBET0SETBEASJMP$INT_T0:MOVTH0,#(65536-50000)/256MOVTL0,#(65536-50000)MOD256INCTCOUNT2SMOVA,TCOUNT2SCJNEA,#40,NEXTMOVTCOUNT2S,#00HINCIDMOVA,IDCJNEA,#04H,NEXTMOVID,#00HNEXT:INCTCNT02SMOVA,TCNT02SCJNEA,#4,DONEMOVTCNT02S,#00HMOVA,IDCJNEA,#00H,SID1CPLP1.0SJMPDONESID1:CJNEA,#01H,SID

34、2CPLP1.1SJMPDONESID2:CJNEA,#02H,SID3CPLP1.2SJMPDONESID3:CJNEA,#03H,SID4CPLP1.3SID4:SJMPDONEDONE:RETIENDC語(yǔ)言源程序#include<AT89X51.H>unsignedchartcount2s;unsignedchartcount02s;unsignedcharID;voidmain(void)(TMOD=0x01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;TR0=1;ET0=1;EA=1;while(1);voidt0(void)i

35、nterrupt1using0(tcount2s+;if(tcount2s=40)(tcount2s=0;ID+;if(ID=4)(ID=0;tcount02s+;if(tcount02s=4)(tcount02s=0;switch(ID)(case0:P1_0=P1_0;break;case1:P1_1=P1_1;break;case2:P1_2=P1_2;break;case3:1. P1_3=P1_3;break;17.99秒馬表設(shè)計(jì)實(shí)驗(yàn)任務(wù)(1.開(kāi)始時(shí)，顯示“00”，第1次按下SP1后就開(kāi)始計(jì)時(shí)(2.第2次按SP1后，計(jì)時(shí)停止。(3.第3次按SP1后，計(jì)時(shí)歸零。電路原理圖VCCklGH

36、D|1Il屹0U1jIIPSOjWCDP3l.TKbFS府jpasmTra.soLP36'VFfiPlniPl2Pl3Pl4Pl5n6PJV8APi.航也PO1/ADlPD2/AD2F0.J/D1PO-4/1D4FQ叩砌XpogwALE哄HP27tt!5P25U13P2.OA12F3MILP22atOP2|'<?P2.0f/8P：J"5j應(yīng)32Ftt?3B礦P7737,2d_P25F24Fp¥iz就勝】51P2Q0roares商MiP20商£0P04PO5w?藝AfsT"如6HOP2. 爻BDrJr圖4.17.1系統(tǒng)板上硬件連線(1

37、.把“單片機(jī)系統(tǒng)”區(qū)域中的P0.0/AD0P0.7/AD7端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a-h端口上；要求：P0.0/AD0對(duì)應(yīng)著a,P0.1/AD1對(duì)應(yīng)著b,，P0.7/AD7對(duì)應(yīng)著h。(2.把“單片機(jī)系統(tǒng)”區(qū)域中的P2.0/A8P2.7/A15端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a-h端口上；要求：P2.0/A8對(duì)應(yīng)著a,P2.1/A9對(duì)應(yīng)著b,，P2.7/A15對(duì)應(yīng)著h。(3.把“單片機(jī)系統(tǒng)“區(qū)域中的P3.5/T1用導(dǎo)線連接到”獨(dú)立式鍵盤(pán)“區(qū)域中的SP1端口上；程序框圖主程序框圖T0中斷服務(wù)程序框圖圖4.17.2匯編源程序TCNTAEQU

38、30HTCNTBEQU31HSECEQU32HKEYCNTEQU33HSP1BITP3.5ORG00HLJMPSTARTORG0BHLJMPINT_T0START:MOVKEYCNT,#00HMOVSEC,#00HMOVA,SECMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVDPTR,#TABLEMOVCA,A+DPTRMOVP2,AMOVTMOD,#02HSETBET0SETBEAWT:JBSP1,WTLCALLDELY10MSJBSP1,WTINCKEYCNTMOVA,KEYCNTCJNEA,#01H,KN1SETBTR0MO

39、VTH0,#06HMOVTL0,#06HMOVTCNTA,#00HMOVTCNTB,#00HLJMPDKNKN1:CJNEA,#02H,KN2CLRTR0LJMPDKNKN2:CJNEA,#03H,DKNMOVSEC,#00HMOVA,SECMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVDPTR,#TABLEMOVCA,A+DPTRMOVP2,AMOVKEYCNT,#00HDKN:JNBSP1,$LJMPWTDELY10MS:MOVR6,#20D1:MOVR7,#248DJNZR7,$DJNZR6,D1RETINT_T0:INCT

40、CNTAMOVA,TCNTACJNEA,#100,NEXTMOVTCNTA,#00HINCTCNTBMOVA,TCNTBCJNEA,#4,NEXTMOVTCNTB,#00HINCSECMOVA,SECCJNEA,#100,DONEMOVSEC,#00HDONE:MOVA,SECMOVB,#10DIVABMOVDPTR,#TABLEMOVCA,A+DPTRMOVP0,AMOVA,BMOVDPTR,#TABLEMOVCA,A+DPTRMOVP2,ANEXT:RETITABLE:DB3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FHENDC語(yǔ)言源程序#include<

41、;AT89X51.H>unsignedcharcodedispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00;unsignedcharsecond;unsignedcharkeycnt;unsignedinttcnt;voidmain(void)unsignedchari,j;TMOD=0x02;ET0=1;EA=1;second=0;P0=dispcodesecond/10;P2=dispcodesecond%10;while(1)if(P3_5=0)(f

42、or(i=20;i>0;i-)for(j=248;j>0;j-);if(P3_5=0)(keycnt+;switch(keycnt)(case1:TH0=0x06;TL0=0x06;TR0=1;break;case2:TR0=0;break;case3:keycnt=0;second=0;P0=dispcodesecond/10;P2=dispcodesecond%10;break;while(P3_5=0);voidt0(void)interrupt1using0(tcnt+;if(tcnt=400)(tcnt=0;second+;if(second=100)(second=0;

43、P0=dispcodesecond/10;P2=dispcodesecond%10;18.“嘀、嘀、”報(bào)警聲實(shí)驗(yàn)任務(wù)用AT89S51單片機(jī)產(chǎn)生“嘀、嘀、”報(bào)警聲從P1.0端口輸出，產(chǎn)生頻率為1KHz根據(jù)上面圖可知：1KH0波從P1.0輸出0.2秒，接著0.2秒從P1.0輸出電平信號(hào)，如此循環(huán)下去，就形成我們所需的報(bào)警聲了。電路原理圖碑十牛十十Ch十If%二.£二WEMs-rM2淺Mxs，TW£VW寸QdEssNovwod一QwlWrfe1OTCIGNDgs.食2總一-JX1二育U2AT&9E51X!ci30pFu盤(pán)CJJOpF.Z«-if#|«己

44、禎|gHpPStj*圖4.18.1系統(tǒng)板硬件連線(1.把“單片機(jī)系統(tǒng)”區(qū)域中的P1.0端口用導(dǎo)線連接到“音頻放大模塊”區(qū)域中的SPKIN端口上，(2.在“音頻放大模塊”區(qū)域中的SPKOU榆口上接上一個(gè)8歐或者是16歐的喇叭；(1.生活中我們常常到各種各樣的報(bào)警聲，例如“嘀、嘀、”就是常見(jiàn)的一種聲音報(bào)警聲，但對(duì)丁這種報(bào)警聲，嘀0.2秒鐘，然后斷0.2秒鐘，如此循環(huán)下去，假設(shè)嘀聲的頻率為1KH乙則報(bào)警聲時(shí)序圖如下圖所示：上述波形信號(hào)如何用單片機(jī)來(lái)產(chǎn)生呢？(2.由丁要產(chǎn)生上面的信號(hào)，我們把上面的信號(hào)分成兩部分，一部分為1KHZ方波，占用時(shí)間為0.2秒；另一部分為電平，也是占用0.2秒；因此，我們利用

45、單片機(jī)的定時(shí)/計(jì)數(shù)器T0作為定時(shí)，可以定時(shí)0.2秒；同時(shí)，也要用單片機(jī)產(chǎn)生1KHZ的方波，對(duì)丁1KHZ勺方波信號(hào)周期為1m§高電平占用0.5ms,低電平占用0.5ms,因此也采用定時(shí)器T0來(lái)完成0.5ms的定時(shí)；最后，可以選定定時(shí)/計(jì)數(shù)器T0的定時(shí)時(shí)間為0.5ms,而要定時(shí)0.2秒則是0.5ms的400倍，也就是說(shuō)以0.5ms定時(shí)400次就達(dá)到0.2秒的定時(shí)時(shí)程序框圖主程序框圖中斷服務(wù)程序框圖圖4.18.2匯編源程序T02SAEQU30HT02SBEQU31HFLAGBIT00HORG00HLJMPSTARTORG0BHLJMPINT_T0START:MOVT02SA,#00HMOV

46、T02SB,#00HCLRFLAGMOVTMOD,#01HMOVTH0,#(65536-500)/256MOVTL0,#(65536-500)MOD256SETBTR0SETBET0SETBEASJMP$INT_T0:MOVTH0,#(65536-500)/256MOVTL0,#(65536-500)MOD256INCT02SAMOVA,T02SACJNEA,#100,NEXTINCT02SBMOVA,T02SBCJNEA,#04H,NEXTMOVT02SA,#00HMOVT02SB,#00HCPLFLAGNEXT:JBFLAG,DONECPLP1.0DONE:RETIENDC語(yǔ)言源程序#in

47、clude<AT89X51.H>unsignedintt02s;unsignedchart05ms;bitflag;voidmain(void)TMOD=0x01;TH0=(65536-500)/256;TL0=(65536-500)%256;TR0=1;ET0=1;EA=1;while(1);voidt0(void)interrupt1using0TH0=(65536-500)/256;TL0=(65536-500)%256;t02s+;if(t02s=400)t02s=0;flag=flag;if(flag=0)P1_0=P1_0;“叮咚”門(mén)鈴19.1.實(shí)驗(yàn)任務(wù)當(dāng)按下開(kāi)關(guān)SP1,AT89S51單片機(jī)產(chǎn)生“叮咚”聲從P1.0端口輸出到LM386經(jīng)過(guò)放大之后送入喇叭。2.電路原理圖39.aU2ftrr.w一£.kl-L*i_3n11JI0反EA4=-笆I2wrs奇a專wN3EWLM-Md_dSOVX.Qd