Section 15 Hitachi Controller Area Network (Hcan); Overview; Features - Hitachi H8S/2646 Hardware Manual

Section 15 Hitachi Controller Area Network (HCAN)

15.1

Overview

The HCAN is a module for controlling a controller area network (CAN) for realtime
communication in vehicular and industrial equipment systems, etc. The H8S/2646 Series has a
single-channel on-chip HCAN module.
Reference: BOSCH CAN Specification Version 2.0 1991, Robert Bosch GmbH
15.1.1

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: Choice of two methods:
 Mailbox (buffer) number order (low-to-high)
 Message priority (identifier) high-to-low order
• Data reception: Two methods:
 Message identifier match (transmit/receive-setting buffers)
 Reception with message identifier masked (receive-only)
• CPU interrupts: Two interrupt vectors:
 Error interrupt
 Reset processing interrupt
 Message reception interrupt (mailbox 1 to 15)
 Message reception interrupt (mailbox 0)
 Message transmission interrupt
• HCAN operating modes: Support for various modes:
 Hardware reset
 Software reset
 Normal status (error-active, error-passive)
 Bus off status
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