h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 564

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Controller Area Network (HCAN)
• Other features: DTC can be activated by message reception mailbox (HCAN mailbox 0 only)
15.1.2
Figure 15.1 shows a block diagram of the HCAN.
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.
Microprocessor Interface (MPI): The MPI, consisting of a bus interface, control register, status
register, etc., controls HCAN internal data, statuses, and so forth.
CAN Data Link Controller (CDLC): The CDLC performs transmission and reception of
messages conforming to the Bosch CAN Ver. 2.0B active standard (data frames, remote frames,
error frames, overload frames, inter-frame spacing), as well as CRC checking, bus arbitration, and
other functions.
Rev. 5.00 Sep 22, 2005 page 538 of 1136
REJ09B0257-0500
 Normal status (error-active, error-passive)
 Bus off status
 HCAN configuration mode
 HCAN sleep mode
 HCAN halt mode
Block Diagram
MBI
Message buffer
MPI
Microprocessor interface
HCAN
Mailboxes
Message control
Message data
MC0–MC15, MD0–MD15
CPU interface
Control register
Status register
Figure 15.1 HCAN Block Diagram
LAFM
Bosch CAN 2.0B active
Data Link Controller
(CDLC)
CAN
Tx buffer
Rx buffer
HTxD
HRxD