Instrukcja obsługi Microchip MCP2518FD
Microchip
Niesklasyfikowane
MCP2518FD
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2017-2020 Microchip Technology Inc. DS20005678E-page 1
HIGHLIGHTS
This manual contains the following major topics:
1.0 Introduction ....................................................................................................................... 2
2.0 Modes of Operation .......................................................................................................... 8
3.0 Configuration................................................................................................................... 13
4.0 Message Transmission ................................................................................................... 26
5.0 Transmit Event FIFO....................................................................................................... 33
6.0 Message Filtering............................................................................................................ 36
7.0 Message Reception ........................................................................................................ 41
8.0 FIFO Behavior................................................................................................................. 45
9.0 Timestamping.................................................................................................................. 58
10.0 Interrupts......................................................................................................................... 59
11.0 Error Handling................................................................................................................. 68
12.0 Appendix A: MCP25XXFD CAN FD SPI API .................................................................. 70
13.0 Related Documents ........................................................................................................ 76
14.0 Revision History .............................................................................................................. 77
CAN FD Controller Module
MCP25XXFD Family Reference Manual
DS20005678E-page 2 2017-2020 Microchip Technology Inc.
1.0 INTRODUCTION
1.1 CAN FD vs. CAN 2.0
CAN FD addresses the increasing demand for bandwidth on CAN buses. The two major
enhancements over CAN 2.0 are:
• Increased data field up to 64 data bytes (from a maximum eight data bytes for CAN 2.0).
• Option to switch to faster bit rate in the data phase. The arbitration bit rate is the same as in
CAN 2.0.
Figure 1-1 shows the possible increase in effective bit rate due to the higher data bit rate and
increased data bytes per frame. The graph uses a CAN FD base frame with 11-bit identifier and
500 kbps bit rate during the arbitration phase.
The CAN FD protocol was defined to allow CAN 2.0 messages and CAN FD messages to co-
exist 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.
The CAN FD protocol (Data Link Layer) is defined in ISO 11898-1:2015.
Figure 1-1: Effective CAN FD Bit Rate
(Base Frame: 11-Bit ID, Nominal Bit Rate = 500 kbps)
Note: This family reference manual section is meant to serve as a complement to the
device data sheet. Please refer to the data sheet for the memory organization and
register definitions of the device.
Device data sheets, application notes and code samples (MCP25XXFD canfdspi
API) are available for download from the Microchip website (www.microchip.com).
All code samples in this manual use the MCP25XXFD canfdspi API. Please refer to
the API header files for the documentation of structures and function prototypes.
0
0 5
1
1 5
2
2 5
3
3 5
4
4 5
0 1 2 3 4 5 6 7 8 9
Effective Bit Rate/Mbps
Data Bit Rate/Mbps
8 Bytes Payload 16 Bytes Payload
24 Bytes Payload 32 Bytes Payload
48 Bytes Payload 64 Bytes Payload
2017-2020 Microchip Technology Inc. DS20005678E-page 3
CAN FD Controller Module
1.2 Features
The CAN FD Controller module has the following features:
General
• External CAN FD Controller with SPI Interface
• 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 ISO 11898-1:2015
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 Transmit Queue (TXQ)
• Programmable Automatic Retransmission Attempts: Unlimited, Three Attempts or Disabled
Message Reception
• 32 Flexible Filter and Mask Objects
• Each Object can be Configured to Filter Either:
- Standard ID + first 18 data bits or
- Extended ID
• 32-Bit Timestamp
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | Niesklasyfikowane |
| Model: | MCP2518FD |
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