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MSP430FR6870: Clock calibration options ?

Part Number: MSP430FR6870

I've found various notes on clock calibration for different members of the MSP430FRxxxx parts but the FR6870 appears to not have the option for any user level trimming of the DCO (factory trim is applied automatically with expected accuracy +/- 3.5%). We were hoping for accuracy closer to +/- 1%, previously achieved by calibration against the LFXT.

Are we stuck with the factory calibration for DCO ? Any options for calibrating the MODOSC ? ... or will the design need to include HFXT for this accuracy ?

Suggestions appreciated, thanks.

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