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1.1
CAN Overview
1.1.1 Features
CAN Overview
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Figure 1–1 shows the major blocks of the eCAN and the interface circuits.
The eCAN module has the following features:
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Fully compliant with CAN protocol, version 2.0B
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Supports data rates up to 1 Mbps
•
Thirty-two mailboxes, each with the following properties:
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Configurable as receive or transmit
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Configurable with standard or extended identifier
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Has a programmable acceptance filter mask
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Supports data and remote frame
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Supports 0 to 8 bytes of data
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Uses a 32-bit time stamp on received and transmitted message
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Protects against reception of new message
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Allows dynamically programmable priority of transmit message
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Employs a programmable interrupt scheme with two interrupt levels
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Employs a programmable interrupt on transmission or reception time-out
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Low–power mode
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Programmable wake–up on bus activity
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Automatic reply to a remote request message
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Automatic retransmission of a frame in case of loss of arbitration or error
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32-bit time-stamp counter synchronized by a specific message (communication in conjunction with
mailbox 16)
•
Self–test mode
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Operates in a loopback mode receiving its own message. A “dummy” acknowledge is provided,
thereby eliminating the need for another node to provide the acknowledge bit.
10
Architecture
SPRU074F – May 2002 – Revised January 2009