CY8C58LP datasheet(43/122 Pages) CYPRESS

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PRELIMINARY

PSoC® 5LP: CY8C58LP Family

Datasheet

Document Number: 001-84932 Rev. **

Page 43 of 122

7.5 CAN

The CAN peripheral is a fully functional Controller Area Network

(CAN) supporting communication baud rates up to 1 Mbps. The

CAN controller implements the CAN2.0A and CAN2.0B

specifications as defined in the Bosch specification and

conforms to the ISO-11898-1 standard. The CAN protocol was

originally designed for automotive applications with a focus on a

high level of fault detection. This ensures high communication

reliability at a low cost. Because of its success in automotive

applications, CAN is used as a standard communication protocol

for motion oriented machine control networks (CANOpen) and

factory automation applications (DeviceNet). The CAN controller

features allow the efficient implementation of higher level

protocols

without

affecting

the

performance

the

microcontroller CPU. Full configuration support is provided in

PSoC Creator.

Figure 7-14. CAN Bus System Implementation

7.5.1 CAN Features

■ CAN2.0A/B protocol implementation - ISO 11898 compliant

❐ Standard and extended frames with up to 8 bytes of data per

frame

❐ Message filter capabilities

❐ Remote Transmission Request (RTR) support

❐ Programmable bit rate up to 1 Mbps

■ Listen Only mode

■ SW readable error counter and indicator

■ Sleep mode: Wake the device from sleep with activity on the

Rx pin

■ Supports two or three wire interface to external transceiver (Tx,

Rx, and Enable). The three-wire interface is compatible with

the Philips PHY; the PHY is not included on-chip. The three

wires can be routed to any I/O

■ Enhanced interrupt controller

❐ CAN receive and transmit buffers status

❐ CAN controller error status including BusOff

■ Receive path

❐ 16 receive buffers each with its own message filter

❐ Enhanced hardware message filter implementation that

covers the ID, IDE and RTR

❐ DeviceNet addressing support

❐ Multiple receive buffers linkable to build a larger receive

message array

❐ Automatic transmission request (RTR) response handler

❐ Lost received message notification

■ Transmit path

❐ Eight transmit buffers

❐ Programmable transmit priority

❐ Round robin

❐ Fixed priority

❐ Message transmissions abort capability

7.5.2 Software Tools Support

CAN Controller configuration integrated into PSoC Creator:

■ CAN Configuration walkthrough with bit timing analyzer

■ Receive filter setup

CAN Node 1

PSoC

CAN Controller

CAN Transceiver

Tx Rx

CAN Node 2

CAN Node n

CAN_H

CAN_L

CAN_H

CAN_L

CAN_H

CAN_L

CAN

Drivers

CAN Bus

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