Threshold: Threshold that must be exceeded by the signal delta2 to arm the trigger (the trigger will actually occur on the zero crossing of delta2).
This is the register DPP_TRG_THRESHOLD (thr)

Trigger Threshold (0x1n6C (channel n), 0x806C (all channels, write only), R/W, )
‐
Bit Description
[13:0] Trigger Threshold value expressed in LSB unit. The threshold is
      referred to the RC-CR2 signal. The trigger fires at the zero
     crossing of the RC-CR2 signal itself.
[31:14] Reserved