Initialization

To operate the PIT, follow these steps:
  1. 1.Configure the RTC clock CLK_RTC as described in Configure the clock CLK_RTC.
  2. 2.Select the period for the interrupt by writing the PERIOD bit field in the PIT Control A register (RTC.PITCTRLA).
  3. 3.Enable the interrupt by writing a '1' to the Periodic Interrupt bit (PI) in the PIT Interrupt Control register (RTC.PITINTCTRL).
  4. 4.Enable the PIT by writing a '1' to the PIT Enable bit (PITENABLE) in the PIT Control A register (RTC.PITCTRLA).