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#pragma interrupt_handler timer0_ovf_isr:10  //TIMER0 ¶¨•r2msÖДà.
void timer0_ovf_isr(void)
{
TCNT0 = 0xD9; //reload counter value
timer2ms++;
    if(timer2ms >= 5)
    {
     timer2ms = 0;
     timer10ms ++;
     systimer10ms ++;
      if(systimer10ms >= 22)  //ƒÈ(n¨¨i)²¿1M¾§Õñ
       {
       systimer10ms = 0;
       timer1s ++;
}
}
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