ST STM32F405 Reference Manual page 1078

Controller area network (bxCAN)
32.3.2 Control, status and configuration registers
The application uses these registers to:
•
Configure CAN parameters, e.g. baud rate
•
Request transmissions
•
Handle receptions
•
Manage interrupts
•
Get diagnostic information
32.3.3 Tx mailboxes
Three transmit mailboxes are provided to the software for setting up messages. The
transmission Scheduler decides which mailbox has to be transmitted first.
32.3.4 Acceptance filters
The bxCAN provides 28 scalable/configurable identifier filter banks for selecting the
incoming messages the software needs and discarding the others.
Receive FIFO
Two receive FIFOs are used by hardware to store the incoming messages. Three complete
messages can be stored in each FIFO. The FIFOs are managed completely by hardware.
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