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How to increase the frequency of the clock?

Wen Li
Expert 7121 points
Other Parts Discussed in Thread: MSP430F5529

I have a MSP430F5529 on the board. Following are the hardware design for the clock.

1. One 12MHz crystal connected XIN and XOUT, each terminal with 22pF caps

2. One 32.768KHz crystal connected to XT2IN and XT2OUT, each terminal with 22pF caps

Everything works fine, but the clock (MLCK) is running at the low frequency. I looked at the output of MCLK, it runs at about 1.4MHz. How do I make it run at higher frequency?

I have tried different clock settings for the registers of UCS, but could not get it work faster.

Thanks and regards

Wen

 

  • 0
    Guru 58965 points

    I think you have both crystals connected to the wrong pins.

    You can use the FLL to adjust the DCO to a higher frequency.

    You need to read the data-sheet and User's Guide.

  • 0
    Expert 2045 points

    Hello!

    First, did you try TI's sample code? In my  case, it works as is.

    I would try their sample code, then check how they do it, understand which register is changed, etc...

    And then try to develop your own code.

    By the way, is it a typo? I think XIN and XOUT should be for the 32k device, and XT2IN / XT2OUT for the

    12MHz device, and apparently you use the opposite. That may be part of your problem.

    Pascal

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