time.c

简易时钟

#include<reg51.h>

unsigned char code Led[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned int count;
unsigned char second,minute,hour;
sbit P1_0=P1^0;
sbit P1_1=P1^1;
sbit P3_0=P3^0;             
sbit P3_1=P3^1;            
sbit P3_2=P3^2;           
sbit P3_3=P3^3;             
sbit P3_4=P3^4;           
sbit P3_5=P3^5;            
sbit P3_6=P3^6;           
sbit P3_7=P3^7;
 
void init()
{
	TMOD=0x01;
	TH0=(65536-2000)/256;
	TL0=(65536-2000)%256;
	second=minute=hour=count=0;
	EA=1;ET0=1;TR0=1;
}

void delay()
{
	unsigned char i;
	for(i=200;i>0;i--);
}

void key()
{
	if(P1_0==0)
	{
		delay();
		if(P1_0==0)
		{
			while(!P1_0);
			minute++;
			if(minute>59)
				minute=0;
		}
	}
	if(P1_1==0)
	{
		delay();
		if(P1_1==0)
		{
			while(!P1_1);
			hour++;
			if(hour>23)
				hour=0;
		}
	}
}

void main()
{
	init();
	while(1);
}

void time0() interrupt 1
{
	static char i=0;
	TH0=(65536-2000)/256;
	TL0=(65536-2000)%256;
	count++;
	P3&=0x00;		//关全部数码管 
	if(i>8)
		i=0;
	key();
	switch (i)
	{
	case 0:
		P3_7=1;
		P2=Led[second%10];
		break;
	case 1:
		P3_6=1;
		P2=Led[second/10];
		break;
	case 2:
		P3_5=1;
		P2=0xbf;
		break;
	case 3:
		P3_4=1;
		P2=Led[minute%10];
		break;
	case 4:
		P3_3=1;
		P2=Led[minute/10];
		break;
	case 5:
		P3_2=1;
		P2=0xbf;
		break;
	case 6:
		P3_1=1;
		P2=Led[hour%10];
		break;
	case 7:
		P3_0=1;
		P2=Led[hour/10];
		break;
	}
	i++;
	if(count==500)
	{
		count=0;
		second++;
		if(second==60)
		{
			second=0;
			minute++;
			if(minute==60)
			{
				minute=0;
				hour++;
				if(hour==24)
					hour=0;
			}
		}
	}
}