ST72561 datasheet(173/262 Pages) STMICROELECTRONICS

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ST72561

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beCAN CONTROLLER (Cont’d)

CAN 2.0B Active Core

The beCAN module handles the transmission and

the reception of CAN messages fully autonomous-

ly. Standard identifiers (11-bit) and extended iden-

tifiers (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 soft-

ware for setting up messages. The Transmission

Scheduler decides which mailbox has to be trans-

mitted 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 complet-

ly by hardware.

Figure 95. CAN Block Diagram

CAN 2.0B Active Core

Mailbox 0

Transmission

Filter

Mailbox 1

Mailbox 0

Receive FIFO

Acceptance Filters

Tx Mailboxes

Master Control

Scheduler

Master Status

Transmit Status

Transmit Prio

Receive FiFO

Error Status

Error Int. Enable

Tx Error Counter

Rx Error Counter

Diagnostic

Bit Timing

Filter Master

Filter Config.

Page Select

Interrupt Enable

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