https://devzone.nordicsemi.com/f/nordic-q-a/66385/uart-break-conditionHello, I found some some threads on similar questions but none answered mine, so here it is: I try to use UART between nrf52840 and another chip. When the other chip resets the RX line goes low and I get a drive error callback. I have two questionsen-USTelligent Community 13Mon, 28 Sep 2020 12:39:20 GMThttps://devzone.nordicsemi.com/thread/271782?ContentTypeID=1Mon, 28 Sep 2020 12:39:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:64d00f41-979c-4573-84ec-754383dff0baVidar Berg<p>Hello,</p> <p>1. Yes, you can enable the pull-up on the RX input. Recommend doing doing it after nrf_serial_init() in case the pull-configuration is overriden by the driver. Eg., call&nbsp; NRF_P0-&gt;CNF[pin_no] |= GPIO_PIN_CNF_PULL_Msk; after serial init.</p> <p>2. The trick to this as I recall it is to re-initialize nrf_serial. But I see you have implemented this already. Can you try to see if you still get this problem with pull up enabled?</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>