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MSP430FR5738: Setting DCO frequency

Ali Aljumaili
Prodigy 250 points
Part Number: MSP430FR5738
Other Parts Discussed in Thread: MSP430F2272, , MSP430FR2433

Hi,

I am migrating from MSP430F2272 to MSP430FR5738, and I notice many benefits, but my application requires setting the DCO frequency from a 5ppm external 32KHz crystal. This was possible in the Flash variant.

Reading the migration datasheet, it says there is a workaround to do this. Is there any documentation regarding this? I know there is an example from msp430fr243x_CS_02.c t but the MSP430FR5738 does not have any BCSCTL1 register.

Thank you.

  • 0
    TI__Genius 12315 points

    The CS module of MSP430FR5738 is different from MSP430F2272. And the DCO doesn't source from external crystal. The DCO frequency can be configured by DCORSEL and DCOFSEL register. If you want DCO frequency sourcing from external 32KHZ crystal, you can choose MSP430FR2433.

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