https://devzone.nordicsemi.com/f/nordic-q-a/111783/nrf53-spi4m-high-frequency-supported-pinsHi, We have a custom board, where we assigned the following pins for SPI4M instance, and the intention is to use it with 32 MHz: SCLK = P1.15 MISO = P1.14 MOSI = P1.13 CS = 1.12 I came across nrfx_spim.c implementation below in nrfx_spim_initen-USTelligent Community 13Tue, 04 Jun 2024 11:44:49 GMThttps://devzone.nordicsemi.com/thread/487297?ContentTypeID=1Tue, 04 Jun 2024 11:44:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5f869d2b-57bc-4cd7-8954-159cc10bcd0aAHaug<p>HI,</p> <p>For the nRF5340 it is these pins that are defined to be the High speed PINs and we don&#39;t recommend that you use any other pins than these for high speed purposes.&nbsp;</p> <p>You can see the pin assignment for the nRF5340 here:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/pin.html#ariaid-title2">https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/pin.html#ariaid-title2</a>&nbsp;</p> <p>Kind regards,<br />Andreas</p><div style="clear:both;"></div>