XC164CS datasheet(41/71 Pages) INFINEON

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XC164

Derivatives

Functional Description

Data Sheet

V2.1, 2003-06

3.13

TwinCAN Module

The integrated TwinCAN module handles the completely autonomous transmission and

reception of CAN frames in accordance with the CAN specification V2.0 part B (active),

i.e. the on-chip TwinCAN module can receive and transmit standard frames with 11-bit

identifiers as well as extended frames with 29-bit identifiers.

Two Full-CAN nodes share the TwinCAN module’s resources to optimize the CAN bus

traffic handling and to minimize the CPU load. The module provides up to 32 message

objects, which can be assigned to one of the CAN nodes and can be combined to FIFO-

structures. Each object provides separate masks for acceptance filtering.

The flexible combination of Full-CAN functionality and FIFO architecture reduces the

efforts to fulfill the real-time requirements of complex embedded control applications.

Improved CAN bus monitoring functionality as well as the number of message objects

permit precise and comfortable CAN bus traffic handling.

Gateway functionality allows automatic data exchange between two separate CAN bus

systems, which reduces CPU load and improves the real time behavior of the entire

system.

The bit timing for both CAN nodes is derived from the master clock and is programmable

up to a data rate of 1 Mbit/s. Each CAN node uses two pins of Port 4, Port 7, or Port 9 to

interface to an external bus transceiver. The interface pins are assigned via software.

Figure 10

TwinCAN Module Block Diagram

M C B 04515

Clo c k

Con tro l

A ddress

De c o de r

Interru p t

Con tro l

CA N

Tw in C A N M odule K e rnel

Po rt

C ontrol

CA N

N ode A

CA N

N ode B

T w inCA N Con tro l

M essage

Obje ct

Buffe r

TXD C A

RX DC A

TXD C B

RX DC B

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