STM8S datasheet(379/467 Pages) STMICROELECTRONICS

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RM0016

Controller area network (beCAN)

427

23.3

beCAN general description

In today’s CAN applications, the number of nodes in a network is increasing and often

several networks are linked together via gateways. Typically the number of messages in the

system (and thus to be handled by each node) has significantly increased. In addition to the

application messages, Network Management and Diagnostic messages have been

introduced.

•

An enhanced filtering mechanism is required to handle each type of message.

Furthermore, application tasks require more CPU time, therefore real-time constraints

caused by message reception have to be reduced.

•

A receive FIFO scheme allows the CPU to be dedicated to application tasks for a long

time period without losing messages.

The standard HLP (Higher Layer Protocol) based on standard CAN drivers requires an

efficient interface to the CAN controller.

•

All mailboxes and registers are organized in 16-byte pages mapped at the same

address and selected via a page select register.

Figure 140. CAN network topology

23.3.1

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.

23.3.2

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

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