Microchip PIC24HJ128GP206 Manual

Microchip Ikke kategoriseret PIC24HJ128GP206

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Side 1/74

ECAN™

Section 21. Enhanced Controller Area Network (ECAN™)

HIGHLIGHTS

This section of the manual contains the following major topics:

21.1 Introduction .................................................................................................................. 21-2

21.2 CAN Message Formats................................................................................................ 21-4

21.3 ECAN Registers...........................................................................................................21-9

21.4 ECAN Message Buffers ............................................................................................. 21-30

21.5 ECAN Operating Modes ............................................................................................ 21-34

21.6 Transmitting ECAN Messages ................................................................................... 21-35

21.7 Receiving ECAN Messages....................................................................................... 21-41

21.8 DMA Controller Configuration .................................................................................... 21-53

21.9 Bit Timing ................................................................................................................... 21-56

21.10 ECAN Error Management .......................................................................................... 21-60

21.11 ECAN Interrupts......................................................................................................... 21-63

21.12 ECAN Low-Power Modes .......................................................................................... 21-66

21.13 ECAN Time Stamping Using Input Capture ............................................................... 21-66

21.14 Register Maps............................................................................................................ 21-66

21.15 Related Application Notes.......................................................................................... 21-73

21.16 Revision History ......................................................................................................... 21-74

PIC24H Family Reference Manual

21.1 INTRODUCTION

The PIC24H Enhanced Controller Area Network (ECAN™) module implements the CAN

Protocol 2.0B, used primarily in industrial and automotive applications. This asynchronous serial

data communication protocol provides reliable communications in electrically noisy

environments. The PIC24H device family integrates up to two ECAN modules. Figure 21-1

illustrates a typical CAN bus topology.

Figure 21-1: Typical CAN Bus Network

The ECAN module supports the following key features:

Standards Compliance:

• Full CAN 2.0B compliance

• Programmable bit rate up to 1 Mbps

Message Reception:

• 32 message buffers – all of them can be used for reception

• 16 acceptance filters for message filtering

• Three acceptance filter mask registers for message filtering

• Automatic response to Remote Transmit Request

• Up to 32-message deep First In First Out (FIFO) buffer

• DeviceNet™ addressing support

• DMA interface for message reception

Message Transmission:

• Eight message buffers configurable for message transmission

• User-defined priority levels for message buffers used for transmission

• DMA interface for message transmission

Others:

• Loopback, Listen All Messages and Listen Only modes for self-test, system diagnostics,

and bus monitoring

• Low-power operating modes

CAN

bus

ECAN1

PIC® MCU

with Integrated

ECAN

CAN

Transceiver

dsPIC33F

with Integrated

ECAN™

dsPIC30F

with Integrated

CAN

Transceiver

CAN Transceiver

CAN

Transceiver

CAN

ECAN2

CAN

Transceiver

PIC24H

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC24HJ128GP206

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