#include //header file
Keywords：AVR Timer
Reference address：AVR Timer Program
interrupt [TIM0_OVF] void timer0(void) //Timer interrupt service function
{
TCNT0=0xff; // Reset the initial value of TCNT0
PORTD.4 = ~PORTD.4; // PD4 reverse output
}
void main(void)
{
DDRD=0XF0; //PD port direction register, high is output, low is input
PORTD=0XFF; //PD port data register writes all 1
TIMSK=0X01; //Open timer, counter 0
TCCR0=0X07; //Timer clock control register
TCNT0=0XFF; //Timing count register
OCR0=0X00; //Output compare register
#asm("sei"); //Open all interrupts
while(1);
}
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