Complementary PWM channels Output

Hardware Arduino Due
8

Could you explain what this is in a little more detail for me? If it's not too much trouble?

  PWM->PWM_TPR = (uint32_t)data;                       // Set the address of the transmit data pointer
  PWM->PWM_TCR = 15;                                   // Set the length of the transmit data
  PWM->PWM_TNPR = (uint32_t)data;                      // Set the next transmit data pointer
  PWM->PWM_TNCR = 15;                                  // Set the next transmit counter
  PWM->PWM_PTCR |= PWM_PTCR_TXTEN;                     // Enable the Peripheral DMA Controller
  PWM->PWM_ENA = PWM_ENA_CHID0;                        // Enable all synchronous PWM channels
}

void loop() {}

void PWM_Handler()
{
  PWM->PWM_TNPR = (uint32_t)data;                      // Set the next transmit data pointer
  PWM->PWM_TNCR = 15;                                  // Set the next transmit counter
  PWM->PWM_ISR2;                                       // Clear the interrupt status register 2
}