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1. The correct WUF has been identified while the SW receiver was active. Note that a WUF (or any bus activity) is required to enable the SW receiver in sleep mode. This is because the SW receiver consumes more power than the LP receiver, so the SW receiver will remain off until bus activity is detected. For this reason, it may take multiple instances of the WUF appearing on the bus before the SW receiver is active and capable of recognizing the frame.
2. A FRAME_OVF condition has occurred. When the transceiver recognizes an error in a received CAN frame, it will increment an internal error counter. If this counter exceeds the configured threshold, the device will wake from sleep mode in order to alert the MCU that there is a problem with the CAN bus. Note that if SW_FD_PASSIVE is set to 0, any CAN FD frame that appears on the bus will be considered an error and increment the error counter. The frame overflow function is a safety feature to ensure that if a node is incapable of recognizing a WUF it will not remain asleep. This is to allow the MCU to diagnose the issue instead of being inaccessible to the system。
