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MSP430FR2032 | FLL settling when referenced to REFO

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How long does it take for DCO to settle at 16MHz, referenced to REFO, when set to this configuration shortly following BOR?  (w/ MSP430FR2032& MSP430FR2033)

 

In the datasheet I see 120ms listed in table 5-4, with XT1 as reference.  However I don’t see a spec listed with REFO as reference. 

 

Driverlib function CS_initFLLSettle() includes a fixed delay of 52ms, which appears to be insufficient. 

 

Please clarify the best practices for using the FLL to set the DCO when using REFO after a BOR.

 

Thanks.



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