15.定时器中断

利用定时器中断0实现LED1的闪烁（亮一秒暗一秒）

#include<reg51.h>
typedef unsigned char u8;
typedef unsigned int u16;

sbit led=P2^0;//D1

void Timer0Init()
{
	TMOD|=0x01;//选择为定时器0模式，方式1，仅TR0控制启动
	TR0=1;//打开定时器0
	EA=1;//总中断
	ET0=1;//打开定时器0中断
	TH0=0xFC;
	TL0=0x18;//赋初值定时1ms
}
void main()
{
	Timer0Init();//定时器0初始化
	while(1);
}
void Timer0() interrupt 1
{
	static u16 i;
	TH0=0xFC;
	TL0=0x18;//给定时器赋初值
	i++;
	if(i==1000)
	{
		led=~led;
		i=0;
	}
}

利用定时器中断1实现LED1的闪烁（亮一秒暗一秒）

#include<reg51.h>
typedef unsigned char u8;
typedef unsigned int u16;

sbit led=P2^0;//D1

void Timer1Init()
{
	TMOD|=0x10;选择为定时器1模式，方式1，仅TR1控制启动
	TR1=1;
	EA=1;
	ET1=1;
	TH1=0xFC;
	TL1=0x18;
}
void main()
{
	Timer1Init();
	while(1);
}
void Timer1() interrupt 3//注意中断号为3
{
	static u16 i;
	TH1=0xFC;
	TL1=0x18;
	i++;
	if(i==1000)
	{
		led=~led;
		i=0;
	}
}

数码管最后一位间隔一秒循环显示0-F

#include<reg51.h>
typedef unsigned char u8;
typedef unsigned int u16;

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

u8 code smgduanxuan[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
                     0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
					  
void Timer1Init()
{
	TMOD=0x10;选择为定时器1模式，方式1，仅TR1控制启动
	EA=1;//打开总中断
	ET1=1;//打开定时器中断1
	TR1=1;//打开定时器中断0
	TH1=0xFC;
	TL1=0x18;//赋初值，定时1ms
}
void main()
{
	LSA=0;
	LSB=0;
	LSC=0;
	Timer1Init();
	while(1);
}
void Timer1() interrupt 3
{
	static u16 i;
	u8 n;
	TH1=0xFC;
	TL1=0x18;
	i++;
	if(i==1000)
	{
		P0=smgduanxuan[n++];
		if(n==16)
		{
			n=0;//显示到第16个数时归零
		}
		i=0;//到1s时归零
	}
}