#define DDRB (*(volatile unsigned char *)(0x17 + 0x20)) /* Registrador de direção dos dados da porta B*/
#define PORTB (*(volatile unsigned char *)(0x18 + 0x20))/* Registrador de dados */
#define IRQ0 __vector_1
#define IRQ1 __vector_2
#define SIGNAL __attribute__ ((signal))
#define GIMSK (*(volatile unsigned char *)(0x3B + 0x20))
#define SREG (*(volatile unsigned char *) (0x3F + 0x20))
void IRQ0 (void) SIGNAL;
void IRQ0 (void)
{
int i;
PORTB = ~PORTB;
for(i = 0; i < 0xffff; i++);
PORTB = PORTB;
for(i = 0; i < 0xffff; i++);
}
void IRQ1 (void) SIGNAL;
void IRQ1 (void)
{
IRQ0();
}
int main (void) {
GIMSK = 0xC0;
SREG = 0x80;
DDRB = 0Xff;
while (1);
return 0;
}