HD6432646 Hitachi, HD6432646 Datasheet - Page 566

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HD6432646

Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet

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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.
532
Other features: DTC can be activated by message reception mailbox (HCAN mailbox 0 only)
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

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