Yes, your interpretation is correct. When we say PRESF (Falling trip voltage) : Min 1.62V Max 1.66V - if VCCD or VCCA drops to anywhere between 1.62V and 1.66V, a PRES reset shall be asserted. Until PRES is asserted - the device shall be in normal operating range, but we do not guarantee full performance if voltage is between 1.66 V and 1.8 V.
Thank you for your answer.
Please tell me a little more.
What kind of performance degradation can it have?