https://devzone.nordicsemi.com/f/nordic-q-a/123682/uarte-hardware-timeoutBoard: nRF5340-DK SDK: nrf ncs v3.0.2 Hi, On the project I am working on there is a tight timing constraint for DMA timeout (30-40us). Also there was a need for specific baudrate. Regarding baudrate I&#39;ve successfully added support for it NRF_UARTE_BAUDRATE_307200en-USTelligent Community 13Fri, 22 Aug 2025 15:42:11 GMThttps://devzone.nordicsemi.com/thread/546493?ContentTypeID=1Fri, 22 Aug 2025 15:42:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1632c795-f183-44b2-aa3d-46cd78c2ebe8Nemanja Jovicic<p>Hi Hung,<br /><br />Colleague opened similar ticket with more info and ongoing discussion here&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/123764/uart-async-rx-latency-when-using-stoprx-task-on-nrf5340/546081">UART Async RX Latency When Using STOPRX Task on nRF5340 - Nordic Q&amp;A - Nordic DevZone - Nordic DevZone<br /><br /></a></p> <p>We can close this ticket as duplicate.<br />Thank you</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/545943?ContentTypeID=1Mon, 18 Aug 2025 14:19:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:82e76eb8-0619-4f6b-8549-3c0686c7c24cHung Bui<p>Hi Nemanja,&nbsp;<br /><br /></p> <p>Do you use 32kHz RC as the source for the LFCLK ? Have you used the 32kHz crystal as the clock source ?&nbsp;</p> <p>I think you are coming close to the limit of the driver. The smallest time the LFCLK can count is&nbsp;30.517us (with some tolerance).&nbsp;<br />You are doing 80us timeout with divider = 2. The CPU has to go through some instructions between the interrupt and the time count. So I&#39;m not so sure 80 with divider = 2 is still in the limit.&nbsp;&nbsp;<br />You may have to modify the driver to be able to achieve smaller timeout.&nbsp;<br /><br />Could you give us a more detailed requirement / how your protocol work so we can give you some advice ?</p><div style="clear:both;"></div>