timer.h~

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bit time_Adc_ok=0;
unsigned int time_Adc;

bit  time_1s_ok=0;
unsigned int time_count;

interrupt [TIM0_COMP] void time0_comp_isr(void)
{
 if(++time_Adc>=250)
    {
    time_Adc=0;
    time_Adc_ok=1;
    }
    
 if(++time_count>=500)
    {
     time_count=0;
     time_1s_ok=1;
    }
}

Time_init()
{
TCCR0=0X0b;
TCNT0=0x00;
OCR0 =0x7C;
TIMSK=0X02;
}