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Section 13 Controller Area Network (HCAN)
Rev. 3.00 Mar. 14, 2006 Page 450 of 804
REJ09B0104-0300
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Support for various modes
Hardware reset
Software reset
Normal status (error-active, error-passive)
Bus off status
HCAN configuration mode
HCAN sleep mode
HCAN halt mode
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Other features
DMAC can be activated by message reception mailbox (HCAN mailbox 0 only)
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Module stop mode can be set
Peripheral address bus
Peripheral data bus
HTxD
MBI
HRxD
CAN
Data Link Controller
MPI
(CDLC)
Tx buffer
Rx buffer
Message buffer
Message control, message data,
MC0 to MC15, MD0 to MD15
LAFM
Mailboxes
Microprocessor interface
CPU interface
Control register
Status register
HCAN
Bosch CAN 2.0B active
Figure 13.1 HCAN Block Diagram
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Message Buffer Interface (MBI)
The MBI, consisting of mailboxes and a local acceptance filter mask (LAFM), stores CAN
transmit/receive messages (identifiers, data, etc.) Transmit messages are written by the CPU.
For receive messages, the data received by the CDLC is stored automatically.
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Microprocessor Interface (MPI)
The MPI, consisting of a bus interface, control register, status register, etc., controls HCAN
internal data, status, and so forth.
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CAN Data Link Controller (CDLC)
The CDLC, conforming to the Bosch CAN Ver. 2.0B active standard, performs transmission
and reception of messages (data frames, remote frames, error frames, overload frames, inter-
frame spacing), as well as CRC checking, bus arbitration, and other functions.
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