https://devzone.nordicsemi.com/f/nordic-q-a/4544/nrf51822ek-communication-with-an-external-mcuHi, I bought nRF51822 Evaluation Kit and would like to blue wire an external MCU( Kinetis Cortex-M) to talk to the SoC. It looks like the SoC on this board has many GPIOs access but I&#39;m not sure which one could make a serial communication with an externalen-USTelligent Community 13Mon, 24 Nov 2014 15:22:57 GMThttps://devzone.nordicsemi.com/thread/16099?ContentTypeID=1Mon, 24 Nov 2014 15:22:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:828be9f1-927d-47d6-9028-74543d088291Fiftiefiftie<p>Thanks for the confirmation!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/16097?ContentTypeID=1Mon, 24 Nov 2014 15:21:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9236a22e-94dc-492c-b830-498a1526ae9fFiftiefiftie<p>Got it! Thanks, Charles!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/16098?ContentTypeID=1Mon, 24 Nov 2014 14:13:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fe8a29be-74a8-4ad1-95b6-5bdaa049e5c6Asbj&#248;rn<p>As Charles is saying, the nRF51822 has an on board pin crossbar for the digital interfaces which means that you can route the UART traffic to any of the GPIOs. The functionality of the pin with regard to SPI, TWI, UART can be defined in firmware.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/16096?ContentTypeID=1Sat, 22 Nov 2014 00:26:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aeb66b04-b6f1-4f9d-b924-95e96ea679adCharles Manning<p>The nRF5 has very flexible pin muxing. You can set up any GPIO pins as RX/TX.</p> <p>You could also use SPI, but UART is probably simpler.</p><div style="clear:both;"></div>