text7.c

51单片计算机中的定时器程序,在keil工程中编译

#include<reg51.h>
#include <intrins.h>
#define uint unsigned int
uint m=0,num,temp=0; 		
 char code table[]={			//之所以用code是因为编译的时候数组放在程序存储器种校?
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
 char code wsle[]={0xff,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};   		
sbit dula=P2^6;
sbit wela=P2^7;
void delay()
{
	int a;
	for(a=0;a<10;a++);
}
void display(uint i,uint j)
{
	dula=1;
	P0=table[j];
	dula=0;
	P0=0xff;    //消隐
	wela=1;
	P0=wsle[i];
	wela=0;

}

int main()
{
	TMOD=0x01;
	TH0=(65536-10000)/256;
	TL0=(65536-10000)%256;
//	TH1=(65536-50000)/256;
//	TL1=(65536-50000)%256;
	EA=1;
	ET0=1;
//	ET1=1;
	TR0=1;
//	TR1=1;
	dula=0;
	wela=0;
	while(1)
	{
		temp=num;
		display(3,temp/100);//秒表
		delay();
		temp=temp%100;
		display(2,temp/10);
		delay();
		display(1,temp%10);
		delay();
	}

	return 0;
}
void timer0() interrupt 1 
{
	TH0=(65536-10000)/256;
	TL0=(65536-10000)%256;
	m++;
	if(m==10)                
		{
			num++;
			m=0;
		}
}
/*
void timer1() interrupt 3  
{
	TH1=(65536-50000)/256;
	TL1=(65536-50000)%256;
	tim++;
}

*/