goi2c.c

断电不丢失秒表

#include<reg52.h>
#include<I2C.h>
#include<max7219.h>
sbit push=P3^3;
uchar tr[10];
uchar num,sum;
#define ord 0xa0
#define add 0x30
void timer_ini();
void main()
{	
	
	timer_ini();
	max_ini();
	sum=read_one(ord,add);	
	while(1)
	{
		if(push==0)
		{
		sum=0;
		}
		display(tr,2);
	}
			
}

void timer_ini()
{
	TMOD=0x01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;
	ET0=1;
	TR0=1;

}

void timer0() interrupt 1
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	num++;
		if(num==20)
	{	
		num=0;
		sum++;
		if(sum==60)
		sum=0;
		send_one(ord,add,sum);
	}
		tr[0]=sum/10;
		tr[1]=sum%10;
	
}