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MSP430FR6989: MSP430FR6989 HFXTCLK High Frequency Clock

Tobi Ka1
Prodigy 170 points
Part Number: MSP430FR6989

Hello,

I need an ~4Mhz clock output from the MSP430 for an ADC. I'd like to use Pin 4.0 and use the MCLK. Is that possible? Do I need an external crystal for the HFXTCLK? How can I get the frequency of the HFXTCLK?

Regards
Tobi

  • 0
    TI__Mastermind 28945 points

    Hello Tobi,

    You can output MCLK on the P4.0 pin or also out SMCLK somewhere.  There is an example close to what you are trying to do called msp430fr69xx_cs_01.c here:http://dev.ti.com/tirex/explore/node?node=ABBcbFOMS6iOgeIh.r-PAg__IOGqZri__LATEST 

    This example generates an 8MHz MCLK and SMCLK from the DCO and output SMCLK on P7.4.  You can divide SMCLK by 2 to reach 4MHz or modify it to lower MCLK and output it on P4.0.    

    As for the HFXT, this is an input for high-frequency crystal oscillators.  You can drive the MSP430FR6989 clocks with a HF crystal, but it is not always required.

    Thanks,

    JD

      

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