roboforum.ru

char mas[]={128,131,....,116,119,122,125}; //тут 256 значений для синуса

int i=0;
const int size=(sizeof(mas)/sizeof(char));
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
   if(i<=size-1){
    OCR0=mas[i];
    i+=4;
  }
  else(i=0);
}

void main(void)
{
DDRB.3=1;

TCNT0=0;
OCR0=0;

TCCR0=(0<<7 )| (1<<6) | (1<<5) | (1<<4) | (1<<3) | (0<<2) | (1<<1) | (1<<0);
TIMSK=(1<<0);

#asm("sei")
while (1)
      {      };
}

uint32_t phase = 0;
uint8_t next = 0;
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
    OCR0 = next;
    phase += 45812985;
    next = mas[phase >> 24];
}