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OVERVIEW OF ENHANCED CAN CONTROLLERS FOR ST7 AND ST9 MCUS

Figure 4. Figure 4: beCAN Block Diagram

The beCAN is based on the same FIFO and filter concept as bxCAN but targets applications

requiring less communication resources. This leads to a reduced processor interface function-

ality.

4 VALIDATION

BxCAN and beCAN are based on the CAN core of BOSCH’s C_CAN controller. This approach

limits the development risk, reusing the huge experience BOSCH has gained during more

than one decade of CAN controller development. To guarantee the compliance of the

BOSCH’s CAN core with the CAN standard, the C_CAN has been validated according to the

ISO standard 16845 „CAN Conformance Testing“. The validation has been performed by the

c&s group led by Prof. Dr. W. Lawrenz located in Wolfenbüttel, Germany.

For several years, c&s has been well accepted world wide as an organisation for CAN con-

troller validation.

CAN 2.0B Active Core

Mailbox 0

Transmission

Filter

1

2

3

Mailbox 1

Mailbox 0

1

2

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

0