https://devzone.nordicsemi.com/f/nordic-q-a/38509/nrf52840-gpio-selectionLooking at the &quot;Pin assignments&quot; section in nRF52840, I found that some GPIO pins are recommended for standard drive, low frequency I/O only. I am wondering whether there is any specification such as how fast the frequency can be or any limitation whenen-USTelligent Community 13Fri, 14 Sep 2018 07:43:03 GMThttps://devzone.nordicsemi.com/thread/148734?ContentTypeID=1Fri, 14 Sep 2018 07:43:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2646935c-f915-41b3-8e88-267b3af1a007ketiljo<p>Anything that will toggle several times during the time the radio is on air will affect it. I2C, SPI, UART etc will typically fall into this category. Chip select, push button, LEDs (not PWM) is ok.</p><div style="clear:both;"></div>