HD6417750RF240V Datasheet, PDF (466/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 15 Controller Area Network (HCAN)
15.7 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.
15.8
This LSI
124 Ω
Vcc
HRxD
HTxD
PCA82C250
RS Vcc
RxD CANH
TxD CANL
Vref GND
NC
CAN bus
124 Ω
Note: NC: No Connection
Figure 15.16 High-Speed Interface Using PCA82C250
Usage Notes
15.8.1 Module Stop Mode Setting
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.
15.8.2 Reset
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
clearing the flag, an HCAN interrupt will be initiated immediately. IRR0 should therefore be
cleared during initialization.
Rev. 7.00 Sep. 11, 2009 Page 430 of 566
REJ09B0211-0700