SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
There are two ways to wake up the DCAN from local power-down mode:
After the INIT bit has been cleared, the module waits until it detects 11 consecutive recessive bits on the CAN_RX pin and then goes bus-active again.
The CAN transceiver circuit has to stay active in order to detect any CAN bus activity while the DCAN is in local power down mode. The first CAN message, which initiates the bus activity, cannot be received. This means that the first message received in power-down and automatic wake-up mode, is lost.
Figure 24-172 shows a flow diagram about entering and leaving local power-down mode.