https://devzone.nordicsemi.com/f/nordic-q-a/10138/maybe-the-document-of-gpio-pin-sensing-mechanism-has-some-wrongmaybe the document of GPIO Pin sensing mechanism has some wrong in the nRF51 Series Reference Manual (version 1.1). sense high/low level defined in the document is different from the code of SDK 9.0.0. high level is 1, low is 2; PIN_CNF[n] (nen-USTelligent Community 13Fri, 13 Nov 2015 06:34:40 GMThttps://devzone.nordicsemi.com/thread/37603?ContentTypeID=1Fri, 13 Nov 2015 06:34:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3267f293-16b1-48c1-a8e5-4c727be2e774hawk<p>great, nRF51 Series Reference Manual(Version 3.0) is OK with SDK 9.0.0, thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37602?ContentTypeID=1Mon, 09 Nov 2015 11:28:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1e07589-7f2a-4eb6-8127-65d1b65e3504Vidar Berg<p>Hi, thanks for reporting this, but this is fixed in the latest revision of the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.pdf.rm/nRF51_RM_v3.0.pdf">nRF51 RM</a> that I checked.</p> <p>From the nrf51_bitfields header:</p> <ul> <li>GPIO_PIN_CNF_SENSE_Disabled (0x00UL) /*!&lt; Disabled. */</li> <li>GPIO_PIN_CNF_SENSE_High (0x02UL) /*!&lt; Wakeup on high level. */</li> <li>GPIO_PIN_CNF_SENSE_Low (0x03UL) /*!&lt; Wakeup on low level. */</li> </ul> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/dummy.PNG" alt="image description" /></p><div style="clear:both;"></div>