Section 15 Hitachi Controller Area Network (Hcan); Features - Hitachi H8S/2628 Hardware Manual

Section 15 Hitachi Controller Area Network (HCAN)

The HCAN is a module for controlling a controller area network (CAN) for realtime
communication in vehicular and industrial equipment systems, etc. For details on CAN
specification, refer to Bosch CAN Specification Version 2.0 1991, Robert Bosch GmbH.
The block diagram of the HCAN is shown in figure 15.1.
15.1

Features

• CAN version: Bosch 2.0B active compatible
 Communication systems: NRZ (Non-Return to Zero) system (with bit-stuffing function)
 Broadcast communication system
 Transmission path: Bidirectional 2-wire serial communication
 Communication speed: Max. 1 Mbps
 Data length: 0 to 8 bytes
• Number of channels: 1
• Data buffers: 16 (one receive-only buffer and 15 buffers settable for transmission/reception)
• Data transmission: Two methods
 Mailbox (buffer) number order (low-to-high)
 Message priority (identifier) reverse-order (high-to-low)
• Data reception: Two methods
 Message identifier match (transmit/receive-setting buffers)
 Reception with message identifier masked (receive-only)
• CPU interrupts: 12
 Error interrupt
 Reset processing interrupt
 Message reception interrupt
 Message transmission interrupt
• HCAN operating modes
• 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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Rev. 1.0, 09/02, page 355 of 568