https://devzone.nordicsemi.com/f/nordic-q-a/20413/how-to-power-cycle-nfctFrom the Nordic errata [141] on NFCT not stopping HFO when going from activated state to sense state: Workaround: Power cycle the NFCT using the POWER register, then issue the SENSE task to enter SENSE mode. What POWER register is referred to?en-USTelligent Community 13Tue, 14 Mar 2017 12:37:59 GMThttps://devzone.nordicsemi.com/thread/79594?ContentTypeID=1Tue, 14 Mar 2017 12:37:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0021b9f3-3c86-4752-98e6-8a653e8fb968FormerMember<p>Unfortunately, the register is not documented anywhere. However, the functionality of the register is the following:</p> <ul> <li>&#39;0&#39; (disabled): The peripheral is powered off</li> <li>&#39;1&#39; (enabled): The peripheral is powered on</li> </ul> <p>Comment: If disabling, then enabling this register, the NFC peripheral and its registers will be reset to its initial state.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79593?ContentTypeID=1Mon, 13 Mar 2017 12:55:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5b8d939a-8428-4cab-a557-910b8ec6be95tkorsdal<p>Found this in hal_nfc_t2t.c of a nfc example:</p> <pre><code>#define NRF_NFCT_POWER (*(uint32_t volatile *)(0x40005FFC)) </code></pre> <p>It seems to do the trick.</p> <p>Is this register documented somewhere?</p><div style="clear:both;"></div>