Microchip PIC32MX575F512H Handleiding


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© 2009-2012 Microchip Technology Inc. DS61154C-page 34-3
Section 34. Controller Area Network (CAN)
Controller Area
Network (CAN)
34
• Additional Features:
- Loopback, Listen All Messages and Listen-Only modes for self-test, system diagnostics
and bus monitoring
- Low-power operating modes
- CAN module is a bus master on the PIC32 system bus
- Does not require Direct Memory Access (DMA) channels for operation
- Dedicated time stamp timer
- Data-only Message Reception mode
Figure 34-2 illustrates the general structure of the CAN module.
Figure 34-2: PIC32 CAN Module Block Diagram
The CAN module consists of a protocol engine, message acceptance filters and Message
Assembly Buffers (MABs). The protocol engine transmits and receives messages to and from the
CAN bus (as per CAN Specification 2.0B). Received messages are assembled in the receive
message assembly buffer. The received message is then filtered by the message acceptance
filters. The transmit message assembly buffer holds the message to be transmitted as it is
processed by the protocol engine.
The CAN message buffers reside in device RAM. There are no CAN message buffers in the CAN
module. Therefore, all messages are stored in device RAM. The CAN module is a bus master on
the PIC32 system bus, and will read and write data to device RAM as required. The CAN module
does not use DMA for its operation and fetches messages from the device RAM without DMA or
CPU intervention.
Message Buffer 31
Message Buffer 1
Message Buffer 0
Message Buffer 31
Message Buffer 1
Message Buffer 0
Message Buffer 31
Message Buffer 1
Message Buffer 0
FIFO0 FIFO1 FIFO31
Device RAM
Up to 32 Message Buffers
CAN Message FIFO (up to 32 FIFOs)
Message
Buffer Size
2 or 4 Words
System Bus
CPU
CAN Module
32 Filters
4 Masks
CxTX
CxRX


Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC32MX575F512H

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