ST92F124 datasheet(326/429 Pages) STMICROELECTRONICS

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CONTROLLER AREA NETWORK (bxCAN)

CONTROLLER AREA NETWORK (Cont’d)

CAN 2.0B Active Core

The bxCAN 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

Three 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 bxCAN provides eight 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 messag-

es can be stored in each FIFO. The FIFOs are

managed completely by hardware.

Figure 143. CAN Block Diagram

Mailbox 2

Mailbox 1

CAN 2.0B Active Core

Mailbox 0

Transmission

Acceptance Filters

Tx Mailboxes

Master Control

Scheduler

Master Status

Transmit Control

Transmit Status

Transmit Priority

Receive FIFO

Error Status

Error Int. Enable

Tx Error Counter

Rx Error Counter

Diagnostic

Bit Timing

Filter Mode

Filter Config.

Page Select

Interrupt Enable

Mailbox 0

Receive FIFO 1

Filter

Mailbox 0

Receive FIFO 0

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