单片机：定时器

实现60S循环计时

#include "reg52.h"

typedef unsigned char u8;
typedef unsigned int u16;

sbit LSA = P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;

u8 code smgduan[]={
	0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};

u8 numCount,ge,shi;
void delayus(u16 i)
{
		while(i--);
}

void display()
{
	LSC=0;LSB=0;LSA=0;
	P0=0x00;
	P0=smgduan[ge];
	delayus(500);
	
	LSC=0;LSB=0;LSA=1;
	P0=0x00;
	P0=smgduan[shi];
	delayus(500);	
}

void InitTimer0(void)
{
	TMOD = 0x01;
	TH0 = 0x3C;
	TL0 = 0xB0;
	EA = 1;
	ET0 = 1;
	TR0 = 1;
}

void main()
{
	InitTimer0();
	while(1)
	{
		display();
	}
}

void timer0() interrupt 1
{
	static u8 num;
	TH0 = 0x3C;
	TL0 = 0xB0;
	num++;
	if(num==20)
	{
		num=0;
		numCount++;
		ge = numCount % 10;
		shi = numCount /10;
		if(numCount == 60)
			numCount=0;
	}
}