AVR MCU GCC Programming: Basic Operations of Timers-EEWORLD

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The following is the query working mode of the timer, and no interrupt request will occur:

#include

int main(void)
{
//8-bit timer time calculation T=(256-initial value) * pulse period

int i;

TCNT0 = 55; //Set the initial value
TCCR0 |= (1 << CS01); //8-division

for (i = 0; i < 10000; i++)
{
while(!(TIFR & TOV0)); //Judge the T/C0 overflow flag, automatically clear it after overflow, and no interrupt occurs.
}
}

In the following working mode, an overflow interrupt request will occur:

#include
#include

volatile unsigned int i = 0; //Note that volatile is required

int main(void)
{
//8-bit timer time calculation T=(256-initial value) * pulse period

TCNT0 = 55; //Set TC0 initial value
TIMSK |= (1 << TOIE0) //TC0 overflow interrupt enable

sei(); //Global interrupt enable
TCCR0 |= (1 << CS01); //8 division, start timer

while(1);
}

SIGNAL (SIG_OVERFLOW0) //TC0 overflow interrupt service routine
{
TCNT0 = 55; //Reset TC0 initial value
i++;
if (cnt >= 1000)
{

}
}

Reference address：AVR MCU GCC Programming: Basic Operations of Timers

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