课程设计

#include<reg52.h>

#define?uchar?unsigned?char

#define?uint?unsigned?int

void?delay(uchar);

void?display();

uchar?numl[]={

0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f};

uchar?t0,flag;

static?uint?num,n0;

sbit?start=P3^5;

sbit?stop=P3^6;

sbit?reset=P3^7;

uchar?ge,shi,bai;

void?main()

{?

EA=1;?

TMOD=0x01;

ET0=1;?

TH0=0x3c;

TL0=0xb6;?

while(1)

{

if(!start)?TR0=1;?

if(!stop)?TR0=0;

if(flag>=2)

{

t0=flag*5;//单位0.01s

flag=0;

num+=t0;

if(num>=6000)num=0;

}

if(!reset)

num=0;

display();

}

}

void?display()

{?n0=num/10;

bai=n0/100;

shi=(n0%100)/10;

ge=n0%10;

P2=numl[ge];

P1=numl[shi];

P0=numl[bai];

}

void?timer0()?interrupt?1?using?3

{?

flag++;

TH0=0x3c;

TL0=0xaa;?

}