Can Bus Interface; Usage Notes; Module Stop Mode Setting; Reset - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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CAN Bus Interface

A bus transceiver IC is necessary to connect this chip to a CAN bus. A Philips PCA82C250

transceiver IC is recommended. Any other product must be compatible with the PCA82C250.

Figure 15.16 shows a sample connection diagram.

HCAN operation can be disabled or enabled using the module stop control register. The initial

setting is for HCAN operation to be halted. Register access is enabled by clearing module stop

mode. For details, refer to section 20, Power-Down Modes.

The HCAN is reset by a power-on reset, in hardware standby mode, and in software standby

mode. All the registers are initialized in a reset, however mailboxes (message control

(MCx[x])/message data (MDx[x])) are not. After power-on, mailboxes (message control

(MCx[x])/message data (MDx[x])) are un-initialized, and their values are undefined. Therefore,

mailbox initialization must always be carried out after a power-on reset, a transition to hardware

standby mode, or software standby mode. The reset interrupt flag (IRR0) is always set after a

power-on reset or recovery from software standby mode. As this bit cannot be masked in the

interrupt mask register (IMR), if HCAN interrupt enabling is set in the interrupt controller without

Note: NC: No Connection

Section 15 Controller Area Network (HCAN)

Rev. 6.00 Mar 15, 2006 page 433 of 570

REJ09B0211-0600