https://devzone.nordicsemi.com/f/nordic-q-a/50909/possible-nrf52840-documentation-defect-on-qdec-pin-ledIn the nRF52840 Product Specification v1.1 ( HTML ) , description of the QDEC peripheral, Table 77 on page 275 ( direct content link) , it appears to indicate that the LED pin for the QDEC peripheral must be set to Input . However, reviewing the documentationen-USTelligent Community 13Tue, 13 Aug 2019 12:53:34 GMThttps://devzone.nordicsemi.com/thread/203825?ContentTypeID=1Tue, 13 Aug 2019 12:53:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:389dcd75-1135-4dd9-9de2-60be5035fe7eSimonr<p>Hi</p> <p>No, this is actually correct. The direction is overridden by the module. You should not modify any configuration while the module is started.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/203682?ContentTypeID=1Mon, 12 Aug 2019 19:09:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3746d024-6e44-4966-8636-ae0870844a27Phase<p><span style="text-decoration:underline;">Update:</span> This question also applies to the remaining nRF52 series&#39; product specification documentation:</p> <ul> <li><a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/qdec.html?cp=3_1_0_35_5#concept_t2t_myd_4r">nRF52832</a></li> <li><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52811/qdec.html?cp=3_2_0_5_12_5#concept_t2t_myd_4r">nRF52811</a></li> <li><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52810/qdec.html?cp=3_3_0_5_12_5#concept_t2t_myd_4r">nRF51810</a></li> </ul> <p>Thus, if this is a documentation defect on the nRF52840, these other three product specifications are also likely to have the same defect.</p> <p></p> <p></p> <p></p><div style="clear:both;"></div>