SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
An RX idle condition is detected when the receiver line (uarti_rxd) is high for a time that equals 4x the programmed word length + 12 bits. uarti_rxd is sampled midway through each bit.
For sleep mode, the counter is reset when there is activity on uarti_rxd.
For the time-out interrupt, the counter counts only when there is data in the RX FIFO, and the count is reset when there is activity on uarti_rxd or when the UARTi.UART_RHR register is read.