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problem in pic18f timer 0 interrupt in Micro C compiler ?

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haroon_tech

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hi,
the code i have written to handle timer0 interrupt .but isr is not executing ......what is problem in my code .the compile is Micro C compiler


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void timer_init(void);
 
void interrupt (void)
 
{
    INTCON.TMR0IF=0;
    
    TMR0L=0X00;
    INTCON.TMR0IE=1;
    T0CON.TMR0ON=1;
 
}
  main()
  {
        timer_init();
        
        while(1);
        
   }
 
 
 
void timer_init(void)
{
INTCON.GIE=1;              //globle interrupt enable
INTCON.PEIE=1;               //peripharel interrupt enable
INTCON.TMR0IF=0;            //clear the timer0 flag
TMR0L=0x00;           //timer0 reg with initial count
//prescalar value 1:256
T0CON.T0PS0=0;
T0CON.T0PS1=0;
T0CON.T0PS2=0;
 
T0CON.PSA=0;             //prescaler is assigned to timer0
//T0SE=0;
T0CON.T0CS=0;
T0CON.T08BIT=1;         //use internal clock or timer mode
INTCON.TMR0IE=1;          //enable the timer0 by setting TRM0IE flag
T0CON.TMR0ON=1;
}
 
Last edited by a moderator:

Do the following changes in your ISR

Code: 
void interrupt()
{
TMR0L = 0x00;
INTCON.TMR0IF = 0;
}

Hope this works
 

How did you deduce that the ISR isn't executing? Are you using the debugger in mikroC? There you can't test the interrupt directly. To do that you need to click the go/jump to interrupt button.

Hope this helps.
Tahmid.
 

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