7630 datasheet(100/238 Pages) RENESAS

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7630 Group User’s Manual

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2.4 Controller Area Network (CAN) module

This section outlines the Controller Area Network (CAN) module of the MCU. First the module’s architecture and the

programming interface with its related special function registers are explained. Second, after having defined the fun-

damental operational modes of the module, the programming sequences to initialize and reset the module are clari-

fied. Third, the module’s communication functions, that is acceptance filtering, reception, and transmission are

discussed in detail. The closing of the section goes into the interrupt capabilities, CAN error conditions, and the

wake-up function.

2.4.1 Description

The CAN module can be characterized as follows:

•

Compatibility: The module’s protocol controller complies with CAN specification version 2.0, part B as defined by

Bosch in September 1991 (this document is later on called

CAN specification). The receive and transmit sec-

tions of the module are capable of handling standard (11-bit identifier) as well as extended (29-bit identifier) for-

mat frames of either data or remote type.

•

CPU interface: The module is memory mapped with sixteen control registers, two interrupt control registers, one

transmission, and two receive buffer register sets.

•

Acceptance filtering: Up to 29-bit identifiers can be filtered by using one set of acceptance mask and code regis-

ters.

•

Multi-channel interrupt capability: Separate interrupt vectors for each event (successful transmission, successful

reception, overrun, error passive, bus off) allow efficient and rapid interrupt service routine operation.

•

Low power (sleep) mode: To reduce power consumption, the module can be set to sleep mode; wake-up from

CAN traffic is supported by a dedicated interrupt source and vector.

•

Priority based message management support: To cope with the problem of priority inversion, the contents of the

transmission buffer can be released, in order to let another higher priority message to take over.

•

Baud rate prescaler: This programmable divider provides a flexible baud rate selection up to 625kbps (at

f(XIN) = 10MHz).

•

Programmable bit timing: The durations of propagation time segment (PTS), phase buffer segments 1 (PBS1),

and 2 (PBS2) are programmable.

•

Physical interface: A two terminal CMOS-compatible interface (formed by ports P31 and P32) allows direct con-

nection to the most popular transceiver devices (e.g. ISO 11898, ISO 11519).

Refer to the block diagram in Figure 2.4.1.

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