h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 458

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Controller Area Network (HCAN)
15.7
A bus transceiver IC is necessary to connect the H8S/2628 Group to a CAN bus. A Philips
PCA82C250 transceiver IC is recommended. If any other product is used, confirm that it is
compatible with the PCA82C250. Figure 15.16 shows a sample connection diagram.
15.8
15.8.1
HCAN operation can be disabled or enabled using the module stop control register. The HCAN
operation is set to be halted initially. Register access is enabled by clearing module stop mode. For
details, refer to section 21, Power-Down Modes.
15.8.2
The HCAN is reset by a power-on reset, in hardware standby mode, and in software standby
mode. All the registers are initialized by a reset, however mailboxes (message control
(MCx[x])/message data (MDx[x])) are not initialized. Mailboxes (message control
(MCx[x])/message data (MDx[x])) are initialized after power-on and at this time, their initial
values are undefined. Therefore, always initialize mailboxes after a power-on reset, a transition to
hardware standby mode, or software standby mode. After a power-on reset or recovery from
software standby mode, the reset interrupt flag (IRR0) is automatically set. Since this bit cannot be
masked in the interrupt mask register (IMR), an HCAN interrupt will be initiated immediately
Rev. 3.00 Oct 04, 2005 page 418 of 598
REJ09B0155-0300
Module Stop Mode Setting
Reset
CAN Bus Interface
Usage Notes
This LSI
Figure 15.16 High-Speed Interface Using PCA82C250
HRxD
HTxD
Note: NC: No connection
NC
PCA82C250
RS
RxD
TxD
Vref
CANH
CANL
GND
Vcc
Vcc
124 Ω
124 Ω
CAN bus