15. Timer Interrupt

Use timer interrupt 0 to flash LED1 (one second on and one second off)

#include

typedef unsigned char u8;

typedef unsigned int u16;

sbit led=P2^0;//D1

void Timer0Init()

{

TMOD|=0x01; //Select timer 0 mode, mode 1, only TR0 controls start

TR0=1; //Turn on timer 0

EA=1; //Total interrupt

ET0=1; //Turn on timer 0 interrupt

TH0=0xFC;

TL0=0x18; //Assign initial value to timing 1ms

}

void main()

{

Timer0Init(); //Timer 0 initialization

while(1);

}

void Timer0() interrupt 1

{

static u16 i;

TH0=0xFC;

TL0=0x18; //Assign initial value to the timer

i++;

if(i==1000)

{

led=~led;

i=0;

}

}

Use timer interrupt 1 to flash LED1 (one second on and one second off)

#include

typedef unsigned char u8;

typedef unsigned int u16;

sbit led=P2^0;//D1

void Timer1Init()

{

TMOD|=0x10; Select timer 1 mode, mode 1, only TR1 control start

TR1=1;

EA=1;

ET1=1;

TH1=0xFC;

TL1=0x18;

}

void main()

{

Timer1Init();

while(1);

}

void Timer1() interrupt 3 //Note that the interrupt number is 3

{

static u16 i;

TH1=0xFC;

TL1=0x18;

i++;

if(i==1000)

{

led=~led;

i=0;

}

}

The last digit of the digital tube displays 0-F in a cycle with an interval of one second.

#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; Select timer 1 mode, mode 1, only TR1 control start

EA=1; //Open the general interrupt

ET1=1; //Open timer interrupt 1

TR1=1; //Turn on timer interrupt 0

TH1=0xFC;

TL1=0x18; //Assign initial value, timing 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; //Return to zero when the 16th number is displayed

}

i=0; //Return to zero at 1s

}

}