I found this nice code, I cannot find which pin on arduino due or it simply does not work
//
/ 1MHz/ 50% Duty cycle PWM thru TIOA0 /
//
void setup() {
/************* Timer Counter 0 Channel 0 to generate PWM pulses thru TIOA0 ************/
PMC->PMC_PCER0 |= PMC_PCER0_PID27; // Timer Counter 0 channel 0 IS TC0, TCO power ON
PMC->PMC_PCER0 |= PMC_PCER0_PID12; // PIOB power ON, page 38
PIOB->PIO_PDR |= PIO_PDR_P25;
PIOB->PIO_ABSR |= PIO_ABSR_P25; // PB25 is driven by the TC, peripheral type B, page 858
TC0->TC_CHANNEL[0].TC_CMR = TC_CMR_TCCLKS_TIMER_CLOCK1 // MCK/2, clk on rising edge
| TC_CMR_WAVE // Waveform mode
| TC_CMR_WAVSEL_UP_RC // UP mode with automatic trigger on RC Compare
| TC_CMR_ACPA_CLEAR // Clear TIOA0 on RA compare match
| TC_CMR_ACPC_SET; // Set TIOA0 on RC compare match