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MSP430FR6043: Register to shift over system clock

Brent Weight
Prodigy 160 points
Part Number: MSP430FR6043

Trying to confirm how many oscillators we really need in our project.  Diagram shows 3 of them -  One 32 kHz and two at 8 MHz. 

In section 9.13.2 Oscillator and Clock System (CS) of the MSP430FR6043 Data Sheet it says :

"The high frequency oscillator XT2 (HF) can be sourced from the oscillator of the ultrasonic subsystem USSXT through an internal connection."

What register needs to be set to enable sharing of this clock between the USS module and XT2 ?  

Are there any side effects to sharing the oscillator or other things to consider?

  • 0
    TI__Genius 16000 points

    Hi Brent,

    This just means that you can utilize an external source for HFXT2, in this case, the oscillator from the ultrasonic subsystem. 

    The registers that control the clock source are described in the family user's guide section 3.3.

    I'm not familiar with any issues that could arise from this. Generally I recommend keeping the USS components separate from everything else in the circuit, as stable voltage, clock frequency, etc, are important for accurate readings, but this shouldn't affect the clock.

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