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MSP430FR5043: USSXTAL startup time long

Joyce Gao
Expert 3150 points
Part Number: MSP430FR5043


Tool/software:

Hi expert,

We met FR5043 USSXTAL start up time long issue, datasheet claimed <2ms for 8MHz crystal, but we met ~7ms such long. What could be the possible reason? Thanks!

Joyce

  • 0
    TI__Mastermind 20847 points

    Hi, 

    For the USSXTAL start up time description, please refer to

    https://www.ti.com/lit/ug/slau367p/slau367p.pdf

    20.2 OSC Control Register (HSPLLUSSXTCTL)

    Here is the Caution description of USSXTAL:

    The application must turn on the USSXT oscillator
(HSPLLUSSXTLCTL.OSCEN = 1) and wait for a sufficient time to let the
oscillator start (this depends on the crystal and resonator characteristics) before
powering up the USS module (see Section 20.4.1).

    This is related to XTAL itself and datasheet's 2ms is not for this function.

    Regards,

    Helic

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