https://devzone.nordicsemi.com/f/nordic-q-a/114698/i2c-communication-failure-during-rtc-interrupt-handling-on-nrf5340In our custom board, nrf5340-nrf7002 ,using external RTC ECS-RTC-SOP8-5101A RTC module, which is connected via the I2C bus. We have configured the RTC&#39;s /INT pin (P1.01) to trigger an interrupt on the nRF5340 when an alarm event occurs. While the interrupten-USTelligent Community 13Fri, 13 Sep 2024 13:04:03 GMThttps://devzone.nordicsemi.com/thread/502485?ContentTypeID=1Fri, 13 Sep 2024 13:04:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc005c3b-34ef-4b22-80b1-3910658ec285Hung Bui<p>Hi Lavanya,</p> <p>Could you tell which error you receive when you got this&nbsp;&quot;Failed to read STATUS register&quot;&nbsp; please print the value of&nbsp;rtc_read_register()</p> <p>Please be aware that if the chip is wake up from&nbsp;<span>SYSTEMOFF, it will reset and booting up. You may want to design your application to handle this. Meaning that the chip is waking up from the RTC it will boot up. So the first thing you want to do with the RTC is to read the status and clear the flag.&nbsp;<br /><br />Please use a logic analyzer to monitor the I2C lines to see if there is any issue there.&nbsp;</span></p><div style="clear:both;"></div>