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

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

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

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

}

}