h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 454

• 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)
HCAN sleep mode is entered by setting the HCAN sleep mode bit (MCR5) to 1 in the master
control register (MCR). If the CAN bus is operating, the transition to HCAN sleep mode is
delayed until the bus becomes idle.
Either of the following methods of clearing HCAN sleep mode can be selected:
In order to re-enter CAN bus communication enabled state, eleven recessive bits must be received
after HCAN sleep mode was cleared.
Clearing by Software: HCAN sleep mode is cleared by writing a 0 to MCR5 from the CPU.
Clearing by CAN Bus Operation: The cancellation method is selected by the MCR7 bit setting
in MCR. Clearing by CAN bus operation occurs automatically when the CAN bus performs an
operation and this change is detected. In this case, the first message is not stored in a mailbox;
messages will be received normally from the second message onward. When a change is detected
on the CAN bus in HCAN sleep mode, the bus operation interrupt flag (IRR12) is set in the
interrupt register (IRR). If the bus interrupt mask (IMR12) in the interrupt mask register (IMR) is
set to enable interrupts at this time, an interrupt can be sent to the CPU.
Rev. 3.00 Oct 04, 2005 page 414 of 598
REJ09B0155-0300
Clearing by software
Clearing by CAN bus operation