41.6.2.1 Initialization

To operate the TRNG, do the following:

Configure the clock source for CLK_TRNG_APB in the Main Clock Controller (MCLK) and enable the clock by writing a ‘1’ to the TRNG bit in the APB Mask register of the MCLK
Enable the TRNG operation by writing a ‘1’ to CTRLA.ENABLE bit (CTRLA.ENABLE <1>)
When the INTFLAG.DATARDY bit (INTFLAG <0>) is set, read the Output Data register (DATA<31:0>) to get the newly generated random number

Note: INTFLAG.DATARDY bit (INTFLAG <0>) is cleared automatically when the DATA register is read.