單片機上機操作考試題部分答案

1、1.使得8個發(fā)光二極管循環(huán)點亮，采用定時器方式0使得每個發(fā)光二極管點亮的時間為0.5s#include<reg51.h>#include<intrins.h>#defineucharunsignedcharucharT_count=0;/定時中斷voidtoProc()interrupt1TH0=(8192-5000)/32;/恢復初值TL0=(8192-5000)%32;if(+T_count=100)/0.5s移動一位P0=_crol_(P0,1);T_count=0;/主函數(shù)voidmain()TMOD=0;TH0=(8192-5000)/32;/5ms定時TL0

2、=(8192-5000)%32;EA=1;ET0=1;TR0=1;P0=0xfe;while(1);2.完成下面電路所示的功能，K1,K2對應兩個開關按鍵。P1口對應發(fā)光二極管的狀態(tài)P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0ooOOooooK1=0,K2=1.ooooK1=1,K2=0.oo.ooK1=1,K2=1.#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharsbitk1=P3人2;sbitk2=P3人3;/延時voiddelay(uintx)uchari;wh

3、ile(-x)for(i=0;i<120;i+);)/主函數(shù)voidmain()(while(1)(if(k1=0)&&(k2=0)(P1=0x00;delay(10);)elseif(k1=0)&&(k2=1)(P1=0xcc;delay(10);)elseif(k1=1)&&(k2=0)(P1=0xf0;delay(10);)else(P1=0xff;delay(10);)3.在一個數(shù)碼管上循環(huán)顯示“H'"E'#include<reg51.h>#defineucharunsignedchar#def

4、ineuintunsignedintucharcodetab=0xf6,0xf9,0xb8,0xb8,0xbf);ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%5;/K1、K2同時按下/K1按下，K2不按/K2按下，K1不按L，“l(fā)，“o，,循環(huán)的時間為1sT_count=0;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);)4.在6個數(shù)碼管上分

5、別顯示自己學號的后六位數(shù)字#include<reg51.h>#include<intrins.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=;/學號自己設置/延時voiddelay(uintx)uchari;while(x-)for(i=0;i<100;i+);/主函數(shù)voidmain()uchark;ucharwei=0x01;P0=tab0;P2=0x01;delay(1000);while(1)for(k=1;k<6;k+)wei=wei<<1;P0=tabk;/發(fā)

6、送數(shù)字段碼P2=wei;/發(fā)送位碼delay(1000);)5.做一個簡易30s的倒計時秒表，秒表的顯示通過8個發(fā)光二極管顯示出來。#include<reg51.h>#defineucharunsignedcharvoiddelay1s()uchari;for(i=0;i<10;i+)TH1=0x3c;TL1=0xb0;TR1=1;/啟動T1while(!TF1);/判斷T1有無請求TF1=0;)voidmain()uchari;uchart;TMOD=0x10;/選擇T1計時while(1)for(i=30;i>0;i-)t=(i/10)<<4)|(i%1

7、0);高四位顯示十位，低四位顯示個位P1=t;delay1s();)）6.使用外中斷0來控制，去實現(xiàn)下列功能。其中K1為按鍵，P1口對應8個發(fā)光二極管的狀態(tài)P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7無按鍵按下（循環(huán)）.OO.OO.OO.有按鍵按下.OOOO#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharucharcodetab=0xcc,0x30;sbitk1=P3人2;/延時voiddelay(uintx)uchari;while(-x)(for(i=0;i<120;i+);

8、)voidint0Proc()interrupt0(P1=0xf0;)/主函數(shù)voidmain()(ucharj;EA=1;EX0=1;IE0=1;while(1)(if(k1=1)/未按下(for(j=0;j<2;j+)(P1=tabj;delay(500);)8.采用定時器方式1使得8個發(fā)光二極管按如下方式點亮，循環(huán)的時間為2sP1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7oooFo.oooo.oo.oo.#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab

9、=0x0f,0xf0,0xcc,0x00;ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=20)(P0=tabi;i=(i+1)%4;T_count=0;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);)9.在一個數(shù)碼管上循環(huán)顯示“0”“1”“5”3個數(shù)字，循環(huán)的時間為1s#include<reg51.h>#defineucharunsignedchar#defineuin

10、tunsignedintucharcodetab=0xbf,0x86,0xed;ucharT_count=0;uchari=1;voidintoProc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)P0=tabi;i=(i+1)%3;T_count=0;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;TR0=1;ET0=1;P0=tab0;/初始化P0口while(1);10.在4個數(shù)碼管上穩(wěn)定顯示出“A”“C”“E”“P”四個字符。#include<reg51.h>#defineucharunsigned

11、char#defineuintunsignedintvoiddelay(uintx)uchari;while(x-)for(i=0;i<100;i+);voidmain()while(1)P0=0xf7;/AP2=0xb9;/CP3=0xf9;/EP1=0xf3;/Pdelay(500);12.做一個20s的簡易秒表，當按鍵K1按下時，秒表暫停計數(shù)，K2按下時，開始計數(shù)#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharuchartab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7

12、d,0x07,0x7f,0x6f;sbitk1=P3人2;sbitk2=P3人3;ucharT_count=0;uchari=0;voiddelay(intx)uchari;while(x-)for(i=0;i<100;i+);voidt0Proc()interrupt1TH0=0x3c;/恢復定時器0初值TL0=0xb0;if(+T_count=10)/100ms*10=1s轉(zhuǎn)換狀態(tài)i+；P0=tabi/10;P2=tabi%10;if(i=20)(i=0;)T_count=0;)voidmain()(P0=tabi;P2=tabi;TMOD=0x01;TH0=0x3c;TL0=0xb

13、0;while(1)(if(k1=0&&k2=1)(EA=0;ET0=0;TR0=0;break;)elseif(k1=1&&k2=0)(EA=1;ET0=1;TR0=1;break;)14.使用外中斷1來控制，當無按鍵按下時8個發(fā)光二極管循環(huán)點亮，循環(huán)點亮的時間為1s,有按鍵按下時，8個發(fā)光二極管全部熄滅。#include<reg51.h>#include<intrins.h>#defineucharunsignedchar#defineuintunsignedintsbitk1=P3人2;ucharcodetab=0x01,0x03,

14、0x07,0x0f,0x1f,0x3f,0x7f,0xff);ucharT_count=0;uchari=1;/T0定時voidT0Proc()interrupt1(TH0=0x3c;TL0=0xb0;if(+T_count=10)(P1=tabi;i=(i+1)%8;T_count=0;/INT1中斷函數(shù)voidInt1Proc()interrupt2(P1=0xff;EA=0;EX1=0;IT1=0;ET0=0;TR0=0;/主程序voidmain()(TMOD=1;EA=1;ET0=1;TR0=1;TH0=0x3c;TL0=0xb0;EX1=1;IT1=1;P1=0xfe;while(1

15、);16.完成下面電路所示的功能，K1,K2對應兩個開關按鍵。P1口對應發(fā)光二極管的狀態(tài)P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0.K1=0,K2=1.ooooK1=1,K2=0oooo.ooK1=1,K2=1o.o.o.o.#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharsbitk1=P3人2;sbitk2=P3人3;/延時voiddelay(uintx)(uchari;while(-x)(for(i=0;i<120;i+);/主函數(shù)voidmain()(w

16、hile(1)(if(k1=1)&&(k2=1)都未按下0:未按下，1:按下(P1=0x00;delay(10);elseif(k1=1)&&(k2=0)/k2按下，k1未按下(P1=0xf0;delay(10);elseif(k1=0)&&(k2=1)/k1按下，k2未按下(P1=0xcf;delay(10);elseif(k1=0)&&(k2=0)/都按下(P1=0x55;delay(10);完成下面電路的功能，P1口對應發(fā)光二極管的狀態(tài)，狀態(tài)1顯示的時間為1s,狀態(tài)2顯示的時間為2s,狀態(tài)3顯示的時間為3s,如此循環(huán)P1.0

17、P1.1P1.2狀態(tài)1.Fo.狀態(tài)2o.狀態(tài)3.o#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x05,0x06,0x03;ucharT_count=0;ucharState=0;uchari=1;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;switch(State)(case0:if(+T_count=10)(P1=tabi;i=(i+1)%3;T_count=0;State=1;break;case1:if(+T_count=20)(

18、P1=tabi;i=(i+1)%3;T_count=0;State=2;break;case2:if(+T_count=30)(P1=tabi;i=(i+1)%3;i=1;T_count=0;State=0;break;voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);)17. 彩燈系統(tǒng)，實現(xiàn)8個發(fā)光二極管從左到右點亮，每個發(fā)光二極管點亮的時間為2s,然后從右到左亮，每個發(fā)光二極管點亮的時間為1.5s.#include<reg51.h>#include<intrins.h>#def

19、ineucharunsignedcharucharcodetab=0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80;ucharcodetab1=0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01;ucharState=0;ucharT_count=0;uchari=1;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;switch(State)case0:if(+T_count=20)P2=tabi;i=(i+1)%8;if(i=7)State=1;T_count=0;break;case1:if(+T_c

20、ount=15)i=(i+1)%8;P2=tab1i;if(i=7)State=0;i=1;T_count=0;break;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P2=tab0;while(1);)18. 在4個數(shù)碼管上顯示出當天的日期。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x06,0x5b,0x06,0x6f);voiddelay(intx)uchari;while(x-)for(i=0;i<

21、;120;i+);)voidmain()P0=tab0;P2=tab1;P3=tab2;P1=tab3;delay(500);)19. 完成下面電路的功能，P1口對應發(fā)光二極管的狀態(tài)，狀態(tài)1顯示的時間為3s,狀態(tài)2顯示的時間為1s,狀態(tài)3顯示的時間為0.5s,狀態(tài)4顯示的時間為0.1s,如此循環(huán)P1.0P1.1P1.2P1.3狀態(tài)1oo.狀態(tài)2o.狀態(tài)3.狀態(tài)4oooo#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab=0x0c,0x0e,0x0f,0x00;ucharT_count

22、=0;ucharState=0;uchari=1;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;switch(State)(case0:if(+T_count=30)(P1=tabi;i=(i+1)%4;T_count=0;State=1;break;case1:if(+T_count=10)(P1=tabi;i=(i+1)%4;T_count=0;State=2;break;case2:if(+T_count=5)(P1=tabi;i=(i+1)%4;T_count=0;State=3;break;case3:if(+T_count=1)(P1=tabi;

23、i=(i+1)%4;T_count=0;State=0;break;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);數(shù)碼管數(shù)字顯示控制程序設計?？刂埔螅河冒存IK1和K2分別控制數(shù)碼管顯示數(shù)字09的順序，當按下K1鍵時按從0到9的順序顯示，當按下K2時按從9到0的順序顯示。時間間隔均為1秒。硬件電路如圖所示。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab1=0x3f,0x06,0x5b,0x

24、4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;ucharcodetab2=0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;ucharT_count=0;sbitk1=P1A0;sbitk2=P1A1;uchari=0;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;if(+T_count=10)T_count=0;i=(i+1)%10;voidmain()TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P0=0x3f;while(1)if(k1=0&

25、;&k2=1)P0=tab1i;elseif(k1=1&&k2=0)(P0=tab2i;23. 89C51與PC通過串口通信，單片機采用方式3串行通信，晶振都采用12MHz，波特率為1200Baud。要求:當單片機收到PC發(fā)來的數(shù)據(jù)“S”后，將30H-3FH的16個字節(jié)發(fā)送給乙機，當單片機收到“P”H時就發(fā)40H-5FH的32個字節(jié)數(shù)據(jù)。#include<reg51.h>#include<stdio.h>char*startPoint;char*endPoint;voidsendData()(if(startPoint<=endPoint)

26、(SBUF=*startPoint;+startPoint;voidstartSend(char*start,char*end)(startPoint=start;endPoint=end;sendData();voidserialPorc()interrupt4(if(TI)(TI=0;sendData();else(RI=0;if(0x53=SBUF)(startSend(0x30,0x3f);elseif(0x50=SBUF)(startSend(0x40,0x5f);voidmain()(TMOD=0x20;TH1=0xe6;TL1=0xe6;TR1=1;SCON=0xd0;EA=1;

27、ES=1;24. while(1);交通控制系統(tǒng)，如下圖所示，是交叉路口，要求：綠燈亮9秒后，黃燈閃3秒，后紅燈亮9秒，兩個數(shù)碼管分別顯視各種燈所剩余時間。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintucharcodetab卜0x6f,0x7f,0x07,0x7d,0x6d,0x66,0x4f,0x5b,0x06,0x3f;ucharcodetab1=0x4f,0x5b,0x06,0x3f;sbitRED_A=P0A0;sbitYELLOW_A=P0A1;sbitGREEN_A=P0A2;sbitRE

28、D_B=P0A3;sbitYELLOW_B=P0A4;sbitGREEN_B=P0A5;ucharOperation_Type=1;/操作類型變量ucharT_count=0;uchari=0;voidt0Proc()interrupt1TH0=0x3c;TL0=0xb0;switch(Operation_Type)case1:/紅燈亮RED_A=0;YELLOW_A=1;GREEN_A=1;RED_B=0;YELLOW_B=1;GREEN_B=1;if(+T_count=90)T_count=0;Operation_Type=2;i=0;if(T_count%10=0)(P3=tabi;P1

29、=tabi;i=(i+1)%10;break;case2:黃燈閃RED_A=1;YELLOW_A=YELLOW_A;GREEN_A=1;RED_B=1;YELLOW_B=YELLOW_B;GREEN_B=1;if(+T_count=30)(T_count=0;Operation_Type=3;i=0;if(T_count%10=0)(P3=tab1i;P1=tab1i;i=(i+1)%3;break;case3:/綠燈亮RED_A=1;YELLOW_A=1;GREEN_A=0;RED_B=1;YELLOW_B=1;GREEN_B=0;if(+T_count=90)(T_count=0;Oper

30、ation_Type=1;i=0;if(T_count%10=0)(P3=tabi;P1=tabi;i=(i+1)%10;break;)voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;P1=tab0;P3=tab0;while(1);)26用外部中斷1實現(xiàn)加計數(shù)功能，并將計數(shù)值輸出到數(shù)碼管上顯示。#include<reg51.h>#defineucharunsignedchar#defineuintunsignedint/09的段碼ucharcodeDSY_CODE卜0x3f,0x06,0x5b,0x4f,0x66,0x6d

31、,0x7d,0x07,0x7f,0x6f,0x00;/計數(shù)值分解后各個待顯示的數(shù)位ucharDSY_Buffer=0,0,0;ucharCount=0;sbitClear_Key=P3人6;/數(shù)碼管上顯示計數(shù)值voidShow_Count_ON_DSY()DSY_Buffer2=Count/100;/獲取3個數(shù)DSY_Buffer1=Count%100/10;DSY_Buffer0=Count%10;if(DSY_Buffer2=0)/高位為0時不顯示DSY_Buffer2=0x0a;if(DSY_Buffer1=0)/高位為0,若第二位為。同樣不顯示DSY_Buffer1=0x0a;P0=D

32、SY_CODEDSY_Buffer0;P1=DSY_CODEDSY_Buffer1;P2=DSY_CODEDSY_Buffer2;/主程序voidmain()P0=0x00;P1=0x00;P2=0x00;EA=1;EX1=1;IT1=1;/下降沿觸發(fā)while(1)(if(Clear_Key=0)(Count=0;/清0Show_Count_ON_DSY();/INT1中斷函數(shù)voidEX_INT1()interrupt2(Count+;/計數(shù)值遞增28.LED燈要求亮2秒鐘，滅2秒鐘，要求使用定時計數(shù)器，要求寫主程序與中斷程序，fosc=6MHz#include<reg51.h>

33、;#defineucharunsignedcharucharT_count=0;sbitLED=P1A0;voidt0Proc()interrupt1(TH0=0x3c;TL0=0xb0;if(+T_count=20)(T_count=0;LED=LED;voidmain()(TMOD=1;TH0=0x3c;TL0=0xb0;EA=1;ET0=1;TR0=1;while(1);29利用外部中斷0,每申請一次中斷使P0口連接的發(fā)光二極管點亮一個，從低位到高位，同時使P1口連接的發(fā)光二極管熄滅一個，從高位到低位#include<reg51.h>#defineucharunsignedcharucharcodetab=0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff);uchari=0;/INT1中斷函數(shù)voidEX_INT1()interrupt2P0=tabi;P1=tabi;if(+i=8)i=0;)/主程序voidmain()P0=0xff;P1=0x00;EA=1;EX0=1;IT0=1;/下降沿觸發(fā)while(1);)31.用定時計