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Using GPIOs marked as "standard drive, low frequency" for SPI on nrf52840

Akshay

I want to understand the meaning of "standard drive, low frequency" GPIO pins. The datasheet mentions to use these pins for frequencies below 10 KHz. Does this limitation apply if I use SPIM on these pins? I tried running the SPIM at 8MHz and did not see any problem. Is it recommended to use only high frequency pins for SPIM?

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    Hi

    Sorry for the late reply, but Håkon is on vacation, and we've just now gotten to his backlog. I can confirm what Akshay is saying. They are not restricted to 10kHz, just recommended to not be set higher due to interference issues with the radio. You're also correct that you can work around it if the radio is not going to run while you do SPI transmissions, but if possible we suggest using the "regular" GPIOs for high freq. serial communication, etc.

    Best regards,

    Simon

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  • 0

    Hi

    Sorry for the late reply, but Håkon is on vacation, and we've just now gotten to his backlog. I can confirm what Akshay is saying. They are not restricted to 10kHz, just recommended to not be set higher due to interference issues with the radio. You're also correct that you can work around it if the radio is not going to run while you do SPI transmissions, but if possible we suggest using the "regular" GPIOs for high freq. serial communication, etc.

    Best regards,

    Simon

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