精選單片機(jī)上機(jī)操作考試題部分答案

1、單片機(jī)上機(jī)操作考試題局部答案使得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#include#define uchar unsigned charuchar T_count=0;/定時中斷void toProc() interrupt 1TH0=(8192-5000)/32; /恢復(fù)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)void main()TMOD=0; TH0=(8192-5000)/32; /5ms定時TL0=(8192-5

2、000)%32;EA=1;ET0=1;TR0=1;P0=0 xfe;while(1);2.完成下面電路所示的功能，K1，K2對應(yīng)兩個開關(guān)按鍵。P1口對應(yīng)發(fā)光二極管的狀態(tài)P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0K1=0,K2=1K1=1,K2=0K1=1,K2=1#include#define uint unsigned int#define uchar unsigned charsbit k1=P32;sbit k2=P33;/延時void delay(uint x)uchar i;while(-x)for(i=0;i120;i+);/主函數(shù)void

3、main()while(1) if(k1=0)&(k2=0) /K1、K2同時按下P1=0 x00;delay(10);else if(k1=0)&(k2=1) /K1按下，K2不按P1=0 xcc;delay(10);else if(k1=1)&(k2=0) /K2按下，K1不按P1=0 xf0;delay(10);elseP1=0 xff;delay(10);3.在一個數(shù)碼管上循環(huán)顯示“H“E “L “L “O ,循環(huán)的時間為1s。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0 xf6

4、,0 xf9,0 xb8,0 xb8,0 xbf;uchar T_count=0;uchar i=1;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=10)P0=tabi;i=(i+1)%5;T_count=0;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;EA=1;TR0=1;ET0=1;P0=tab0; /初始化P0口while(1);4.在6個數(shù)碼管上分別顯示自己學(xué)號的后六位數(shù)字。#include#include#define uchar unsigned char#define uint u

5、nsigned intuchar code tab=;/學(xué)號自己設(shè)置/延時void delay(uint x)uchar i;while(x-)for(i=0;i100;i+);/主函數(shù)void main()uchar k;uchar wei=0 x01;P0=tab0;P2=0 x01;delay(1000);while(1)for(k=1;k6;k+)wei=wei1;P0=tabk;/發(fā)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#define uchar unsigned charvo

6、id delay1s()uchar i;for(i=0;i0;i-) t=(i/10)4)|(i%10); /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)以下功能。其中K1為按鍵，P1口對應(yīng)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)有按鍵按下#include#define uint unsigned int#define uchar unsigned charuchar code tab=0 xcc,0 x30;sbit k1=P32;/延時void delay(uint x)uchar

7、 i;while(-x)for(i=0;i120;i+);void int0Proc() interrupt 0P1=0 xf0;/主函數(shù)void main()uchar j;EA=1; EX0=1;IE0=1;while(1)if(k1=1) /未按下for(j=0;j2;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2sP1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7#include#define uchar unsigned char#define uint unsigned intuchar code

8、tab=0 x0f,0 xf0,0 xcc,0 x00;uchar T_count=0;uchar i=1;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=20)P0=tabi;i=(i+1)%4;T_count=0;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;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#define uchar unsigned char#define

9、 uint unsigned intuchar code tab=0 xbf,0 x86,0 xed;uchar T_count=0;uchar i=1;void intoProc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=10)P0=tabi;i=(i+1)%3;T_count=0;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;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#define uchar

10、 unsigned char#define uint unsigned intvoid delay(uint x)uchar i;while(x-)for(i=0;i100;i+);void main()while(1)P0=0 xf7; /AP2=0 xb9; /CP3=0 xf9; /EP1=0 xf3; /Pdelay(500);12.做一個20s的簡易秒表，當(dāng)按鍵K1按下時，秒表暫停計數(shù)，K2按下時，開始計數(shù)。#include#define uint unsigned int#define uchar unsigned charuchar tab=0 x3f,0 x06,0 x5b,0

11、 x4f,0 x66,0 x6d,0 x7d,0 x07,0 x7f,0 x6f;sbit k1=P32;sbit k2=P33;uchar T_count=0;uchar i=0;void delay(int x)uchar i;while(x-)for(i=0;i100;i+);void t0Proc() interrupt 1TH0=0 x3c; /恢復(fù)定時器0初值TL0=0 xb0;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;void main()P0=tabi;P2=

12、tabi;TMOD=0 x01;TH0=0 x3c; TL0=0 xb0;while(1)if(k1=0 & k2=1)EA=0;ET0=0;TR0=0;break;else if(k1=1 & k2=0)EA=1;ET0=1;TR0=1;break;14.使用外中斷1來控制，當(dāng)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#include#define uchar unsigned char#define uint unsigned intsbit k1=P32;uchar code tab=0 x01,0 x03,0 x07

13、,0 x0f,0 x1f,0 x3f,0 x7f,0 xff;uchar T_count=0;uchar i=1;/T0定時void T0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=10)P1=tabi;i=(i+1)%8;T_count=0;/INT1中斷函數(shù)void Int1Proc() interrupt 2P1=0 xff;EA=0;EX1=0;IT1=0;ET0=0;TR0=0;/主程序void main()TMOD=1;EA=1;ET0=1; TR0=1;TH0=0 x3c;TL0=0 xb0;EX1=1;IT1=1;P1=0

14、 xfe;while(1);16. 完成下面電路所示的功能，K1，K2對應(yīng)兩個開關(guān)按鍵。P1口對應(yīng)發(fā)光二極管的狀態(tài)P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7K1=0,K2=0K1=0,K2=1K1=1,K2=0K1=1,K2=1#include#define uint unsigned int#define uchar unsigned charsbit k1=P32;sbit k2=P33;/延時void delay(uint x)uchar i;while(-x)for(i=0;i120;i+);/主函數(shù)void main()while(1) if(k1=1)&(k2

15、=1)/都未按下0：未按下，1:按下P1=0 x00;delay(10);else if(k1=1)&(k2=0) /k2按下，k1未按下P1=0 xf0;delay(10);else if(k1=0)&(k2=1) /k1按下，k2未按下P1=0 xcf;delay(10);else if(k1=0)&(k2=0) /都按下P1=0 x55;delay(10);17.完成下面電路的功能，P1口對應(yīng)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)P1.0P1.1P1.2狀態(tài)1狀態(tài)2狀態(tài)3#include#define uchar unsigne

16、d char#define uint unsigned intuchar code tab=0 x05,0 x06,0 x03;uchar T_count=0;uchar State=0;uchar i=1;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;switch(State)case 0:if(+T_count=10)P1=tabi;i=(i+1)%3;T_count=0;State=1;break;case 1:if(+T_count=20)P1=tabi;i=(i+1)%3;T_count=0;State=2;break;case 2:if(

17、+T_count=30)P1=tabi;i=(i+1)%3;i=1;T_count=0;State=0;break;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);18.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#include#define uchar unsigned charuchar code tab=0 x01,0 x02,0 x04,0 x08,0 x10,0 x20,0 x40,0 x8

18、0;uchar code tab1=0 x80,0 x40,0 x20,0 x10,0 x08,0 x04,0 x02,0 x01;uchar State=0;uchar T_count=0;uchar i=1;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;switch(State)case 0:if(+T_count=20)P2=tabi;i=(i+1)%8;if(i=7)State=1;T_count=0;break;case 1:if(+T_count=15)i=(i+1)%8;P2=tab1i;if(i=7)State=0;i=1;T_cou

19、nt=0;break;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;EA=1;ET0=1;TR0=1;P2=tab0;while(1);在4個數(shù)碼管上顯示出當(dāng)天的日期。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0 x06,0 x5b,0 x06,0 x6f;void delay(int x)uchar i;while(x-)for(i=0;i120;i+);void main()P0=tab0;P2=tab1;P3=tab2;P1=tab3;delay(50

20、0);20. 完成下面電路的功能，P1口對應(yīng)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)1狀態(tài)2狀態(tài)3狀態(tài)4#include#define uchar unsigned char#define uint unsigned intuchar code tab=0 x0c,0 x0e,0 x0f,0 x00;uchar T_count=0;uchar State=0;uchar i=1;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;s

21、witch(State)case 0:if(+T_count=30)P1=tabi;i=(i+1)%4;T_count=0;State=1;break;case 1:if(+T_count=10)P1=tabi;i=(i+1)%4;T_count=0;State=2;break;case 2:if(+T_count=5)P1=tabi;i=(i+1)%4;T_count=0;State=3;break;case 3:if(+T_count=1)P1=tabi;i=(i+1)%4;T_count=0;State=0;break;void main()TMOD=1;TH0=0 x3c;TL0=0

22、xb0;EA=1;ET0=1;TR0=1;P1=tab0;while(1);數(shù)碼管數(shù)字顯示控制程序設(shè)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(dāng)按下K1鍵時按從0到9的順序顯示，當(dāng)按下K2時按從9到0的順序顯示。時間間隔均為1秒。硬件電路如下圖。#include#define uchar unsigned char#define uint unsigned intuchar code tab1=0 x3f,0 x06,0 x5b,0 x4f,0 x66,0 x6d,0 x7d,0 x07,0 x7f,0 x6f;uchar code tab2=0 x6f,0 x7f,0

23、x07,0 x7d,0 x6d,0 x66,0 x4f,0 x5b,0 x06,0 x3f;uchar T_count=0;sbit k1=P10;sbit k2=P11;uchar i=0;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=10)T_count=0;i=(i+1)%10;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;EA=1;ET0=1;TR0=1;P0=0 x3f;while(1)if(k1=0 & k2=1)P0=tab1i;else if(k1=1 & k2=0)P0=tab2

24、i;24. 89C51與PC通過串口通信，單片機(jī)采用方式3串行通信，晶振都采用12MHz，波特率為1200Baud。要求：當(dāng)單片機(jī)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(jī)，當(dāng)單片機(jī)收到“PH時就發(fā)40H-5FH的32個字節(jié)數(shù)據(jù)。#include#includechar *startPoint;char *endPoint;void sendData()if(startPoint = endPoint)SBUF=*startPoint;+startPoint;void startSend(char *start ,char *end)startPoint=start;en

25、dPoint = end;sendData();void serialPorc() interrupt 4if(TI)TI=0;sendData();elseRI=0;if(0 x53=SBUF)startSend(0 x30,0 x3f);else if(0 x50=SBUF)startSend(0 x40,0 x5f);void main()TMOD=0 x20;TH1=0 xe6;TL1=0 xe6;TR1=1;SCON=0 xd0;EA=1;ES=1;while(1);交通控制系統(tǒng)，如以下圖所示，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

26、間。#include#define uchar unsigned char#define uint unsigned intuchar code tab=0 x6f,0 x7f,0 x07,0 x7d,0 x6d,0 x66,0 x4f,0 x5b,0 x06,0 x3f;uchar code tab1=0 x4f,0 x5b,0 x06,0 x3f;sbit RED_A=P00; sbit YELLOW_A=P01;sbit GREEN_A=P02;sbit RED_B=P03; sbit YELLOW_B=P04;sbit GREEN_B=P05;uchar Operation_Type=

27、1; /操作類型變量uchar T_count=0;uchar i=0;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;switch(Operation_Type)case 1:/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=tabi;i=(i+1)%10;break;case 2: /黃燈閃RED_A=1;YELLOW_A=YELL

28、OW_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;case 3: /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;Operation_Type=1;i=0;if(T_count%10=0)P3=tabi;P1=tabi;i=(i+

29、1)%10;break;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;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#define uchar unsigned char#define uint unsigned int/09的段碼uchar code DSY_CODE=0 x3f,0 x06,0 x5b,0 x4f,0 x66,0 x6d,0 x7d,0 x07,0 x7f,0 x6f,0 x00;/計數(shù)值分解后各個待顯示的數(shù)位uchar DSY_

30、Buffer=0,0,0;uchar Count=0;sbit Clear_Key=P36;/數(shù)碼管上顯示計數(shù)值void Show_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=0 x0a;if(DSY_Buffer1=0) /高位為0，假設(shè)第二位為0同樣不顯示DSY_Buffer1=0 x0a;P0=DSY_CODEDSY_Buffer0;P1=DSY_CODEDSY_Buffer1;

31、P2=DSY_CODEDSY_Buffer2;/主程序void main()P0=0 x00;P1=0 x00;P2=0 x00;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)void EX_INT1() interrupt 2Count+; /計數(shù)值遞增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#define uchar unsigned charuchar T_count=0;sbit L

32、ED=P10;void t0Proc() interrupt 1TH0=0 x3c;TL0=0 xb0;if(+T_count=20)T_count=0;LED=LED;void main()TMOD=1;TH0=0 x3c;TL0=0 xb0;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#define uchar unsigned charuchar code tab=0 x01,0 x03,0 x07,0 x0f,0 x1f,0 x3f,0 x7f,0 xff;uchar i=0;/INT1中斷函數(shù)void EX_INT1() interrupt 2P0=tabi;P1=tabi;if(+i=8)i=0;/主程序void main()P0=0 xff;P1=0 x00;EA=1;EX0=1;IT0=1; /下降沿觸發(fā)while(1);用定時計數(shù)器T1定時，由P0控制8個指示燈，首先依次點亮，每個指示燈點亮1秒，8個燈點亮完后，接著是間隔點亮，指示燈點亮0.5秒，上述過程重復(fù)循環(huán)。Fosc