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15.7
CAN Bus Interface
A bus transceiver IC is necessary to connect the H8S/2628 Series 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.
RS
RxD
TxD
Vref
Vcc
CANH
CANL
GND
HRxD
NC
Note: NC: No Connection
HTxD
This LSI
CAN bus
124
124
Vcc
PCA82C250
Figure 15.16 High-Speed Interface Using PCA82C250
15.8
Usage Notes
15.8.1
Module Stop Mode Setting
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 Reset
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
after an HCAN interrupt is enabled by the interrupt controller without clearing the flag. IRR0
should therefore be cleared at initialization.
Содержание H8S/2627
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