SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Wake-up interrupt is a special interrupt that works differently from other interrupts. This interrupt is enabled when the UARTi.UART_SCR[4] RX_CTS_WU_EN bit is set to 1. The UARTi.UART_IIR register is not modified when this occurs; the UART3.UART_SSR[1] RX_CTS_WU_STS bit must be checked to detect a wake-up event.
When a wake-up interrupt occurs, it can be cleared only by resetting the UARTi.UART_SCR[4] RX_CTS_WU_EN bit. This bit must be reenabled (set to 1) after the current wake-up interrupt event is processed to detect the next incoming wake-up event.