单片机上机操作考试题及答案
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单片机上机考试试题
1.使得8个发光二极管循环点亮，采用定时器方式0使得每个发光二极管点亮的时间为。
#include <>
int count=0;
int minute=0;
int temp;
char code style[8]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};
void desplay()
{
temp=minute%8;
P0= style[temp];
}
void toProc() interrupt 1
{
count++;
TH0=0x0c;
TL0=0x78;
}
void main()
{
TMOD=0;
TH0=0x0c;
TL0=0x78;
TR0=1;
ET0=1; EA=1;
while(1)
{
if(count==100)
{
minute++;
count=0;
}
desplay();
}
}
2.完成下面电路所示的功能，K1，K2对应两个开关按键。P1口对应发光二极管的状态
K1=0,K2=0 ○ ○ ○ ○ ○ ○ ○ ○ K1=0,K2=1 ● ● ● ● ○ ○ ○ ○
K1=1,K2=0 ● ● ○ ○ ● ● ○ ○
K1=1,K2=1 ● ● ● ● ● ● ● ●
#include <>
char code style[4]={0x0,0xf0,0x33,0xff};
sbit P1_0=P1^0;
sbit P1_1=P1^1;
void main()
{
P0=0xff;
while(1)
{
if(P1_0==0&&P1_1==0)
{
P0=style[0];
}
if(P1_0==0&&P1_1==1)
{
P0=style[1];
}
if(P1_0==1&&P1_1==0)
{
P0=style[2];
}
if(P1_0==1&&P1_1==1)
{ P0=style[3];
}
}
}
3.在一个数码管上循环显示“H”“E” “L” “L” “O” ,循环的时间为1s。
#include <>
char code style[5]={0x89,0x86,0xc7,0xc7,0xc0};
int i;
int count=0;
int second=0;
void t0Pro() interrupt 1
{
count++;
TL0=0xB0;
TH0=0x3c; }
void display()
{
i=second%5;
P0=style[i];
}
void main()
{
TMOD=0x01;
EA=1;
TR0=1;
ET0=1;
TL0=0xB0;
TH0=0x3c;
while(1)
{
if(count==20)
{
second++;
count=0;
}
display();
}
}
4.在6个数码管上分别显示自己学号的后六位数字。
#include<>
char code code1[]={0x4f,0x4f,0x01,0x06,0x06,0x4f};
sbit p1_0=P1^0;
char num;
void delay(int timer)
{
while(timer)
{
--timer; }
}
void main()
{
int i;
while(1)
{
num =0xFE;
for(i=0;i<6;i++)
{
P1=num;
P2=code1[i];
delay(1000);
num=(num<<1)|1;
}
}
}
5.做一个简易30s的倒计时秒表，秒表的显示通过8个发光二极管显示出来。
#include<>
#include""
int count;
count=0;
void t0Proc() interrupt 1
{
TH0=0x3c;
TL0=0xb0;
count++;
if(count==10)
{
P0=P0+1;
count=0; if(P0==0xff)
{
P0=0xe1;
}
}
}
void main()
{
EA=1;
ET0=1;
TMOD=1;
TH0=0x3c;
TL0=0xb0;
TR0=1;
P0=0xe1;
while(1);
}
6.使用外中断0来控制，去实现下列功能。
其中K1为按键，P1口对应8个发光二极管的状态
无按键按下（循环） ● ● ○ ○ ● ● ○ ○
● ● ● ● ○ ○ ● ●
有按键按下 ● ● ● ● ○ ○ ○ ○
#include<>
过A/D转换电路，将模拟电压值在两个发光二极管上显示出来。（查询和中断方式均可）
#include<>
#include<>
#define a XBYTE[0xcfa8]
sbit p=P3^2;
sbit shi=P3^4;
sbit ge=P3^5; void sepr(unsigned char w);
void disp();
unsigned char i,x,chh,chl;
void main()
{
while(1)
{
adc0809=0;
while(p);
x=adc0809;
sepr(x);
disp();
}
}
void sepr(unsigned char w)
{
unsigned char ch;
ch=w;
chh=ch/51;
ch=ch%51;,
chl=(ch*10)/51;
}
void disp()
{
unsigned char led1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; unsigned char led2[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef };
shi=0;
ge=1;
a=led2[chh];
for(i=0;i<50;i++);
shi=1;
ge=0;
a=led1[chl];
for(i=0;i<50;i++);
}
8. 采用定时器方式1使得8个发光二极管按如下方式点亮，循环的时间为2s
○ ○ ○ ○ ● ● ● ●
● ● ● ● ○ ○ ○ ○
● ● ○ ○ ● ● ○ ○
● ● ● ● ● ● ● ●
#include <>
char code style[4]={0x0f,0xf0,0xcc,0xff};
int i;
int count=0;
int second=0;
void t0Pro() interrupt 1
{
count++;
TL0=0xB0; TH0=0x3c;
}
void display()
{
i=second%4;
P0=style[i];
}
void main()
{
TMOD=0x01;
EA=1;
TR0=1;
ET0=1;
TL0=0xB0;
TH0=0x3c;
while(1)
{
if(count==40)
{
second++;
count=0;
}
display();
}
