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TMS470MF06607: Microcontroller Wakeup issue

Part Number: TMS470MF06607

I am using TMS470MF06607 controller for FT and SW CAN application.

i am using 16Mhz crystal as a external clock source. 

In few Boards, i am observing that upon power up Micro controller is waking up after 15 to 20 seconds.

I am seeing the issue in several boards. initial i thought it is crystal issue. but i changed the crystal part. 

Still i am facing the issue.  would an suggest what will be root cause for the issue?

Regards

Arun.