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LP-MSPM0G3507: Periodic noise on VREF

Part Number: LP-MSPM0G3507
Other Parts Discussed in Thread: MSPM0G3507

Regarding VREF of MSPM0G3507

A program with VREF enabled is written on the evaluation board and the output is checked with an oscilloscope.
Noise appears approximately every 8 ms.
I don't know the cause and I'm having trouble.
Noise data is attached. Could you please confirm?
Noise1  Periodic noise


Noise2  Noise expansion


The evaluation board used is MSPM0G3507 Rev.B.
The firmware used is attached.
・Verification environment
SDK:
mspm0 sdk : 1.20.01.06
Code Composer Studio: 12.5.0.00007

empty_LP_MSPM0G3507_nortos_ticlang.zip