ST72561J4-Auto datasheet(217/324 Pages) STMICROELECTRONICS

217 / 324 page

ST72561-Auto

beCAN controller (beCAN)

Doc ID 12370 Rev 8

217/324

Figure 94.

CAN network topology

CAN 2.0B active core

The beCAN 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.

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

Tx mailboxes

Two transmit mailboxes are provided to the software for setting up messages. The

Transmission Scheduler decides which mailbox has to be transmitted first.

Acceptance filters

The beCAN provides six scalable/configurable identifier filter banks for selecting the

incoming messages the software needs and discarding the others.

Receive FIFO

The receive FIFO is used by the CAN controller to store the incoming messages. Three

complete messages can be stored in the FIFO. The software always accesses the next

available message at the same address. The FIFO is managed completely by hardware.

CAN

High

Low

CAN

Transceiver

CAN

Controller

ST9 MCU

CAN Bus

Application

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