51 single chip microcomputer program - timer control buzzer-EEWORLD

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#include

#define uint unsigned int

sbit bb=P3^5; //bit definition buzzer interface

sbit led1=P0^0; //bit definition LED interface

unsigned int i=0;

void delay(uint z); //delay function declaration

void main()

{

TMOD=0x01; //TMOD assignment to determine the working mode of T0 and T1

TH0=(65536-50000)/256; //Calculate the initial value and write it into TH0, TL0 or TH1, TL1

TL0=(65536-50000)%6;

EA=1; //Open the general interrupt

ET0=1; //Enable timer 0 interrupt

TR0=1; //Start timer 0

while(1)

{

if(i==20) //Timer count time 20*50MS=1S

{

i=0; //clear flag

led1=0;

bb=0;

delay(500);

led1=1;

bb=1;

delay(500);

}

void exter0() interrupt 1 //Timer 0 interrupt function

{

TH0=(65536-50000)/256; //The timer initial value also needs to be assigned in the interrupt function

TL0=(65536-50000)%6;

i++; //The timer increments i by one every 50MS

}

void delay(uint z) //delay function

{

uint x,y;

for(x=z;x>0;x--)

for(y=20;y>0;y--);

}

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