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TDA4VH-Q1: WKUP_OSC0 start up timing?

Part Number: TDA4VH-Q1

Tool/software:

What would be the reason that the WKUP_OSC0, which is powered from VDDA_WKUP, is expected to start up only between times T3 & T4 during the power on sequence - whereas the OSC1 which is powered from VDDA_OSC1 is expected to start as soon as its supply (VDDA_OSC1) starts to rise?

What is enabling the ramp of WKUP_OSC0?

[from TDA4xx specification, SPRSP79B]

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