#include <avr/io.h>
#define OVERFLOW 256
#define TICKS_PER_SEC 1000
int main()
{
unsigned int tick_time=0;
DDRA = 0xFF;
TCNT0 = OVERFLOW - 125;
TCCR0 = 0x05;
for(;) {
while(TIFR & 0x01) {
TIFR |= 0x01;
TCNT0 = OVERFLOW - 125;
tick_time++;
if(tick_time == TICKS_PER_SEC) {
PORTA = ~PORTA;
tick_time = 0;
}
}
}
return (1);
}
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