AVR external interrupt operation under IAR-EEWORLD

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Chip: ATMega16

Crystal: 7.3728 MHz

External interrupt 0, falling edge triggered.

About hardware: If you want to use external interrupts stably, it is best to pull up a resistor at the pin (usually 10K, of course, whether to pull up or pull down depends on your trigger conditions). If it is a button, you should add a capacitor (usually 104). This will have a better effect and effectively prevent jitter.

Code:

#include
#include
#include

void int0_init()
{
_CLI(); //disable all interrupts //Disable total interrupt

MCUCR = 0x02; //Falling edge triggers external interrupt 0
GICR = 0x40; //Enable external interrupt 0
GIFR_INTF0 = 1; //Clear external interrupt 0 flag

_SEI(); //re-enable interrupts //Open general interrupt
}

void main(void)
{
DDRB_Bit0 = 1; //define an LED
int0_init();

while(1);
}

#pragma vector = INT0_vect //External interrupt 0 entry address
__interrupt void ex_int0(void)
{
PORTB_Bit0 = ~PORTB_Bit0; //Each time an interrupt is entered, an LED will turn from bright to dark, and from dark to bright
}

Keywords：IAR AVR Reference address：AVR external interrupt operation under IAR

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