void timer0_isr (void)
{
  ***
  // мигнуть диодом
}

char InitTimer()
{  
  AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_TC0;// Enable Clock for TIM0
  AT91C_BASE_TC0->TC_CCR    = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
  AT91C_BASE_TC0->TC_CMR    = 2 | AT91C_TC_CPCTRG;
  AT91C_BASE_TC0->TC_RC     = 0x0E; // ??

  // TIM0 Interrupt: Mode and Vector with Lowest Priority and Enable
  AT91C_BASE_AIC->AIC_SMR[AT91C_ID_TC0] = AT91C_AIC_SRCTYPE_INT_POSITIVE_EDGE | AT91C_AIC_PRIOR_HIGHEST;
  AT91C_BASE_AIC->AIC_SVR[AT91C_ID_TC0] = (unsigned long) timer0_isr;
  AT91C_BASE_AIC->AIC_IECR = (1 << AT91C_ID_TC0);
  AT91C_BASE_TC0->TC_IER    = AT91C_TC_CPCS;

  return 1;
}

char InitTimer()
{  
  AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_TC0;// Enable Clock for TIM0
  AT91C_BASE_TC0->TC_CCR    = AT91C_TC_CLKEN | AT91C_TC_SWTRG;  // Зачем-то сразу запустили таймер. Это нужно делать в самом конце.
  AT91C_BASE_TC0->TC_CMR    = 2 | AT91C_TC_CPCTRG;  // С такими настройками будете получать прерывание каждые 10мкс.
  // Для однократной задержки логично использовать режим Wave и поставить бит CPCSTOP
  AT91C_BASE_TC0->TC_RC     = 0x0E; // ??

  // TIM0 Interrupt: Mode and Vector with Lowest Priority and Enable
  AT91C_BASE_AIC->AIC_SMR[AT91C_ID_TC0] = AT91C_AIC_SRCTYPE_INT_POSITIVE_EDGE | AT91C_AIC_PRIOR_HIGHEST;  // Зачем прерывание по фронту?
  AT91C_BASE_AIC->AIC_SVR[AT91C_ID_TC0] = (unsigned long) timer0_isr;
  AT91C_BASE_AIC->AIC_IECR = (1 << AT91C_ID_TC0);
  AT91C_BASE_TC0->TC_IER    = AT91C_TC_CPCS;

  return 1;
}

volatile unsigned char doo = 0;

__arm void tim0isr (void)
{
  
  doo = 1;  

  AT91C_BASE_AIC->AIC_EOICR = AT91C_BASE_TC0->TC_SR;
  AT91C_BASE_AIC->AIC_IVR        = 0;
  AT91C_BASE_AIC->AIC_ICCR = 1 << AT91C_ID_TC0;    
  AT91C_BASE_AIC->AIC_EOICR   = 0;
  AT91C_BASE_TC0->TC_IDR = AT91C_TC_CPCS;
}

char InitTimer()
{
  AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_TC0;// Enable Clock for TIM0
  
  // TIM0 Interrupt: Mode and Vector with Lowest Priority and Enable
  AT91C_BASE_AIC->AIC_SMR[AT91C_ID_TC0] = AT91C_AIC_PRIOR_HIGHEST;
  AT91C_BASE_AIC->AIC_SVR[AT91C_ID_TC0] = (unsigned long) tim0isrEntry;
  AT91C_BASE_AIC->AIC_IECR = (1 << AT91C_ID_TC0);

  AT91C_BASE_TC0->TC_CMR    = TC_CLKS_MCK32 | AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_CPCSTOP;  

  return 1;
}

void DELAY_MK(unsigned short coef)
{  
  unsigned int delay = ((coef*22)/15);  

  AT91C_BASE_TC0->TC_RC     = delay;
  
  AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;
  
  doo = 0;

AT91C_BASE_TC0->TC_CCR    = AT91C_TC_CLKEN | AT91C_TC_SWTRG;  
  
  while(!doo)
   ;
}

DELAY_MK(3000);
DELAY_MK(4000);
DELAY_MK(5000);
DELAY_MK(6000);
DELAY_MK(2000);
DELAY_MK(10000);
DELAY_MK(17000);

for(int i =0; i < 20000; i++)
      DELAY_MK(6);

  unsigned int delay = ((coef*22)/15);

volatile unsigned int x = us * 12;

while(--x);