https://devzone.nordicsemi.com/f/nordic-q-a/64232/how-to-change-modesI wrote two applications, and both will never know what application starts first. So I design a handshake that works something like this. receiver Set to receiver, look for transmitter to send a NOP. transmitter must first set to receiveren-USTelligent Community 13Tue, 28 Jul 2020 13:58:38 GMThttps://devzone.nordicsemi.com/thread/262018?ContentTypeID=1Tue, 28 Jul 2020 13:58:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cad59cd3-6a04-4720-9fa3-d909db641f06H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>The startup time required depends directly on your external 16M crystals physical parameters, which can be up to 4.5 ms if the series inductance is high. See parameter &quot;Tpd2stby&quot; in the PS, chapter 6.1.7 &quot;Timing Information&quot;.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/261856?ContentTypeID=1Mon, 27 Jul 2020 22:59:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e9eda5f5-fc3c-4b3f-8774-5a79d4d9e157ulao<p>OH, I found adding a 20 ms wait after my clock function did it. I was playing with 2ms with no luck, is there a require time?</p><div style="clear:both;"></div>