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MSP430F6779A: Is there specification about VLO Clock start-up time

TinK
Intellectual 815 points
Part Number: MSP430F6779A


Is there specification about VLO Clock start-up time?

After reset, How long do we have to wait for the VLO clock to stabilize?

  • 0
    TI__Mastermind 26575 points

    Hi TinK,

    I also do not find the start-up time for VLO clock.

    Actuallt after reset, you should wait for internal oscillator ready and then run boot code and application code. I think it not necessary for focus on VLO start up time.

    B.R.

    Sal

  • 0 in reply to Sal Ye
    TI__Mastermind 26575 points

    Also,

    In the application code, when you enable VLO for some clock resource, I think it unnecessary to wait for VLO ready, or you can set a relatively small waiting time, such as 1us.

    B.R.

    Sal

  • 0 in reply to Sal Ye
    Intellectual 815 points

    Hi Sal,

    Thank for information.

    Now i have some problem related to the Auxiliary module that use VLOCLK same as issues below.

    e2e.ti.com/.../msp430f6779a-auxxsw-not-operation

    AUX2SW, AUX1SW and AUX0SW are always zero after the code "AUXCTL0 = AUXKEY"(tests using a DVCC supply on 3.3 and then off 0 V, problems occurring in approximately 0.1 % of the total number of trials).

    Is the VLO clock always ready to work after released from the MCU reset state?

    Do you think possible to cause from VLO clock not work in short time from reset? (so may need to add delay time before setting the AUX module)

  • 0 in reply to TinK
    TI__Mastermind 26575 points

    Hi Tink,

    TinK said:
    Is the VLO clock always ready to work after released from the MCU reset state?

    From my perspective, I think it is ready.

    How about the DVCC supply volateg? I actually find a ERRATA which descibes a bug:

    B.R.

    Sal

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