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Controller Area Network
22.1 CAN 2.0B Features
The CAN Controller has the following features:
• Full compliance with 2.0A and 2.0B Bosch specifications
• Support for both 11-bit and 29-bit identifiers
• Support for bit rates up to 1Mbit/s
• 64-byte receive FIFO
• Software-driven bit-rate detection for hot plug-in support
• Single-shot transmission option
• Acceptance filtering
• Listen Only Mode
• Reception of 'own' messages
• Error interrupt generated for each CAN bus error
• Arbitration-lost interrupt with record of bit position
• Read/write error counters
• Last error register
• Programmable error-limit warning.
22.2 CAN Theory of Operation
The CAN Controller has two operating modes:
• Operating Mode, during which data can be transmitted and received.
• Reset Mode, in which special modes of operation, such as changing the values for
the Receive and Transmit Error Counters and the Error Warning Limit Register, can
be performed.
Reset Mode can be enabled by either setting the Reset Mode in the Mode Register or
through a System Reset. The Mode Register also allows special modes to be selected,
such as Listen Only Mode and Self Test Mode.
22-2
LH75400/01/10/11 (Preliminary) User's Guide
6/17/03
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