https://devzone.nordicsemi.com/f/nordic-q-a/29760/nrf52840-spi-simultaneous-connectionHi, from the nRF52840&#39;s datasheet: Up to 4x SPI masters/3x SPI slaves with EasyDMA . Is it possible to connect the nRF52840 as a slave with another microcontroller and simultaneously as a master with a sensor using SPI? If yes, could you please giveen-USTelligent Community 13Thu, 25 Jan 2018 14:11:35 GMThttps://devzone.nordicsemi.com/thread/117995?ContentTypeID=1Thu, 25 Jan 2018 14:11:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0f624830-dafa-4978-bb86-5f97fd8d732eMartinBL<p>Hi,</p> <p>Q1) Yes, you can be a <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/spis.html?cp=2_0_0_30#concept_z12_hz2_wr">slave</a> and <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/spim.html?cp=2_0_0_29#concept_j35_hv2_wr">master</a> at the same time. Just make sure to use <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/peripheral_interface.html?cp=2_0_0_13_1#concept_shared_id">two different instances of the SPI</a>. For example SPIM0 and SPIS1.</p> <p>Q2) You, can use any pins you like. The only recommendation we have is to not place high frequency signals, such as SPI signals, close to the antenna.</p><div style="clear:both;"></div>