https://devzone.nordicsemi.com/f/nordic-q-a/14796/explanation-on-peripheral-shared-resourcesI don&#39;t know why I didn&#39;t notice this blurb in the reference manual sooner. In pretty much all peripheral sections (such as SPI), you have this warning: Therefore, the user must disable all peripherals that have the same ID as the SPI before theen-USTelligent Community 13Wed, 29 Jun 2016 17:17:59 GMThttps://devzone.nordicsemi.com/thread/56493?ContentTypeID=1Wed, 29 Jun 2016 17:17:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ae7a8a2-764d-416f-8766-e1c6260991dcHenry Choi<p>Thank you. I see the explanation in nRF51 reference manual, section 10.1.1 Peripheral ID now. Would be a good idea to put a link to that section from the above blurb in every peripheral chapter. Just a suggestion.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56492?ContentTypeID=1Tue, 28 Jun 2016 04:10:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd16a0af-7d94-48d3-be1c-3f72383bdce3RK<p>The ID is not the digit ending the peripheral name, that&#39;s the instance. The ID is the ID of the peripheral in the system (one ID equals one base address equals one set of registers so you can&#39;t use more than one peripheral sharing the same ID at the same time).</p> <p>You didn&#39;t say whether you were using nRF51 or nRF52. For nRF51 see Table 5.2 and for nRF52 see Table 8.4 for the list of peripherals and IDs. As you can see only a few peripherals really share IDs and those tend to make sense, ie SPIM0/SPIS0 on the nRF52 and SPI0/TWI0 on the nRF51</p><div style="clear:both;"></div>