TIMER DELAY PROBLEM……..

[maharudra bade]

Hello…..friends……

I am using timer0 and timer1 in mode 2,external clock=11.0592mhz,to generate pulses of 10us on two pins of uc with an delay of 100us  I am loading TLO=0XF6 for 10us

& TH1=OXA3;for 100us delay…..here is my program……in output i am getting delay of approx…8ms…despite of 100us…..please anybody help me out this problem…..

//OM NAMAH SHIVAY……

//XTAL FREQ=11.0592 MHZ…

 

 

#include <reg52.h> 

 

sbit key   = P2^0;

 

sbit wave1 = P2^4;

sbit wave2 = P2^5;

 

void timer1_init(void);

void timer0_init(void);

void _delay_ms(int ms);

 

void main(void)

{

_delay_ms(10);

 

key=1;wave1=wave2=0;

T0=0;T1=0;

timer0_init();

timer1_init();

 

while(1)

{

 

if(key == 0)

{

_delay_ms(10);

TR1 = 1;TR0=1; //START THE TIMER…….

wave1 = 1;

 

while(TF1 == 0); //WAIT UNTILL TIMER OVERFLOWS…

TR1 = 0; //STOP TIMER…

TF1 = 0;         //CLEAR OVERFLOW FLAG…

wave1=0;

 

while(TF0==0);

TF0=0;TR0=0;

 

TR1=1;

wave2 = 1;

while(TF1==0);

TF1=0;

TR1=0;

wave2 = 0;  

}

 

}

}

void timer0_init(void)

{

TMOD = 0x02; //timer0  8 bit auto-reload mode…..

TH0 = 0xA3; //100 us pulse…..

}

 

void timer1_init(void)

{

TMOD = 0x20;

TH1 = 0xF6; //10us pulse……

}

void _delay_ms(int ms)

{

  int i,j;

 for(i=0;i<ms;i++)

  for(j=0;j<=1274;j++);

}

 

[Vishnu V]

Hi,

How to create timer interup in python??

 

[Ashutosh Bhatt]

to create 100 us delay using timer in mode 2 you have to load value 255-100 = 155 = 9Bh

[Author]

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