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MSP430FR5969: How many LFXT clock cycles error before switching to LFMODCLK?

MichRFT
Expert 2110 points
Part Number: MSP430FR5969

Hello,

It is specified how many LFXT clock cycles error are needed before switching to LFMODCLK? (during normal running, not at the startup condition)

Best regards

Mich

  • 0
    Guru 303850 points

    The User's Guide says:

    A valid cycle is any cycle that meets the frequency requirement as outlined in the device specific data sheet. Any crystal fault restarts the counter.

    The "any" means that the fault handling triggers when a cycle is longer than fFault,LF. So with fFault,LF between 10 Hz and 10 kHz, i.e., between 0.1 ms and 0.1 s, the corresponding number of 32.768 kHz cycles is somewhere between 3 and 3277.

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