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MSP430FR5043: The operation of an MSP430FR5043 by shifting the clock.

Conor
Mastermind 8815 points
Part Number: MSP430FR5043

Hi, 

We are using the DCO at 8MHz on MSP430 and I am investigating whether it is possible to shift the DCO to 8.1MHz using the FR5043's functions. It seems that the FR4xx/FR2xx have a DCO trimming function that allows the frequency to be shifted. However, the FR5xx does not seem to have such a function.

 - https://www.ti.com/lit/an/slaa992/slaa992.pdf

 - https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/558079/msp430fr6989-custom-dco-trimming-calibration

Do you have any ideas?

Thanks,

Conor

  • 0
    TI__Guru 56685 points

    Conor,

    The technique outlined by SLAA992 is only valid for MSP430FR4xxx/FR2xxx devices.  MSP430FR5043 has a fixed frequency DCO. If you wanted something specific outside these frequencies, you would need to feed the MCU a clock via the HFXT input pins, either through a crystal or in bypass mode with digital clock. 

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