Microchip dsPIC33CK256MP405 Manual

Microchip Ikke kategoriseret dsPIC33CK256MP405

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 2018-2022 Microchip Technology Inc. and its subsidiaries DS70005340C-page 1

This section of the manual contains the following major topics:

1.0 Introduction ....................................................................................................................... 2

2.0 CAN FD Message Frames................................................................................................ 5

3.0 Control Registers .............................................................................................................. 9

4.0 Modes of Operation ........................................................................................................ 53

5.0 Configuration................................................................................................................... 59

6.0 Message Transmission ................................................................................................... 72

7.0 Transmit Event FIFO – TEF ............................................................................................ 81

8.0 Message Filtering............................................................................................................ 86

9.0 Message Reception ........................................................................................................ 91

10.0 FIFO Behavior................................................................................................................. 97

11.0 Timestamping................................................................................................................ 108

12.0 Interrupts....................................................................................................................... 109

13.0 Error Handling............................................................................................................... 116

14.0 Related Application Notes............................................................................................. 118

15.0 Revision History............................................................................................................ 119

CAN Flexible Data-Rate (FD) Protocol Module

dsPIC33/PIC24 Family Reference Manual

DS70005340C-page 2 2018-2022 Microchip Technology Inc.and its subsidiaries

1.0 INTRODUCTION

CAN Flexible Data-Rate (FD) addresses the increasing demand for bandwidth on CAN buses.

The two major enhancements over CAN 2.0B consist of:

• Increased data field of up to 64 data bytes (from a maximum eight data bytes for CAN 2.0B)

• Option to switch to faster bit rate after the arbitration field

Figure 1-1 shows the possible increase in net bit rate due to the higher Data Bit Rate (DBR) and

increased data bytes per frame.

Figure 1-1: Net CAN FD Bit Rate

The CAN FD protocol is defined to allow CAN 2.0 messages and CAN FD messages to coexist

on the same bus. This does not imply that non-CAN FD controllers can be mixed with CAN FD

controllers on the same bus. Non-CAN FD controllers will generate error frames while receiving

a CAN FD message.

1.1 Features

The CAN FD module has the following features:

General

• Nominal (Arbitration) Bit Rate up to 1 Mbps

• Data Bit Rate up to 8 Mbps

• CAN FD Controller modes:

- Mixed CAN 2.0B and CAN FD mode

- CAN 2.0B mode

• Conforms to ISO11898-1:2015

Message FIFOs

• 31 FIFOs Configurable as Transmit or Receive FIFOs

• One Transmit Queue (TXQ)

• Transmit Event FIFO (TEF) with 32-Bit Timestamp

Message Transmission

• Message Transmission Prioritization:

- Based on priority bit field and/or

- Message with lowest ID gets transmitted first using the TXQ

• Programmable Automatic Retransmission Attempts: Unlimited, Three Attempts or Disabled

Frame ID: 11-Bit, Bit Rate Arbitration: 1 Mbit

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	dsPIC33CK256MP405

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