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MSP430F5659: SPI operating frequency

Radhakrishnan VG
Intellectual 300 points

Part Number: MSP430F5659

Hi,

I am using msp430f5659 for my project. From the user guide, I learnt that XT2 can use upto 32M crystal. But in datasheet under SPI mode column, SPI max frequency is given as 20M.

With a prescaler value of 0, can we reliably use SPI mode with 32M crystal? Kindly advice.

  • 0
    Guru 102665 points

    No.

    1) The data sheet is authoritative. If it says you can't, then you can't.

    2) There's no option (UCSSEL) to run the SPI from the crystal. The crystal can supply SMCLK, but SMCLK is limited to 20MHz. You can use a faster crystal, but you have to divide it down.

    Being able to run the SPI up to fSYSTEM is actually pretty good. Many MCUs limit you to fSYSTEM/2.

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