Can Functional Overview - Intel 8XC196K Series User Manual

Table of Contents

CAN SERIAL COMMUNICATIONS CONTROLLER

The 87C196CA has a peripheral not found in the 8XC196Kx and 8XC196Jx controllers — the

CAN (controller area network) peripheral. The CAN serial communications controller manages

communications between multiple network nodes. This integrated peripheral is similar to Intel's

standalone 82527 CAN serial communications controller. It supports both the standard and the

extended message frames specified by CAN 2.0 protocol parts A and B developed by Robert

Bosch, GmbH. This chapter describes the integrated CAN controller and explains how to config-

ure it. Consult Appendix B, "Signal Descriptions," for detailed descriptions of the signals dis-

cussed in this chapter.

12.1 CAN FUNCTIONAL OVERVIEW

The integrated CAN controller transfers messages between network nodes according to the CAN

protocol. The CAN protocol uses a multiple-master, contention-based bus configuration, which

is also called CSMA/CR (carrier sense, multiple access, with collision resolution). Each CAN

controller's input and output pins are connected to a two-line CAN bus through which all com-

munication takes place (Figure 12-1).

Transmission

Figure 12-1. A System Using CAN Controllers

Security System