During Sleep mode, all clocks to the EUSART are suspended. Because of this, the Baud Rate Generator is inactive and a proper character reception cannot be performed.
The Auto-Wake-up feature allows the controller to wake-up due to activity on the RX/DT line. This feature is available only in Asynchronous mode.
The Auto-Wake-up feature is enabled by setting the WUE bit of the BAUDCTL register. Once set, the normal receive sequence on RX/DT is disabled and the EUSART remains in an Idle state, monitoring for a wakeup event independent of the CPU mode. A wake-up event consists of a high-to-low transition on the RX/DT line.
1. How to wake up from Hardware UART RX pin? 2. Or May i implement the RX pin connect to RB pin(Use PORTB Interrupt on Change)?when start bit is low the MCU wake up and start receive RX?