Can 2.0B Active Core; Control, Status And Configuration Registers; Tx Mailboxes; Acceptance Filters - ST STM32F101 series Reference Manual

Controller area network (bxCAN)
24.3.1

CAN 2.0B active core

The bxCAN module handles the transmission and the reception of CAN messages fully
autonomously. Standard identifiers (11-bit) and extended identifiers (29-bit) are fully
supported by hardware.
24.3.2

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
24.3.3

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.
24.3.4

Acceptance filters

The bxCAN provides 28 scalable/configurable identifier filter banks for selecting the
incoming messages the software needs and discarding the others. In other devices there
are 14 scalable/configurable identifier filter banks.
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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Figure 221. CAN network topology

MCU
Application
CAN
Controller
CAN CAN
Rx Tx
CAN
Transceiver
CAN CAN
High Low
CAN Bus
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