h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 500

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 14 Controller Area Network (HCAN)
CPU interrupt source settings: CPU interrupt source settings are made in the interrupt mask
register (IMR) and mailbox interrupt register (MBIMR). The message to be received is also
specified. Data frame and remote frame receive wait interrupt requests can be generated for
individual mailboxes in the MBIMR.
Arbitration field setting: To receive a message, the message identifier must be set in advance in
the message control registers (MCx[1] to MCx[8]) for the receiving mailbox. When a message is
received, all the bits in the receive message identifier are compared with those in each message
control register identifier, and if a complete match is found, the message is stored in the matching
mailbox. Mailbox 0 has a local acceptance filter mask (LAFM) that allows Don't Care settings.
The LAFM setting can be made only for mailbox 0. By setting the Don't Care for all the bits in the
receive message identifier, messages of multiple identifiers can be received.
Examples:
• When the identifier of mailbox 1 is 010_1010_1010 (standard format), only one kind of
• When the identifier of mailbox 0 is 010_1010_1010 (standard format) and the LAFM setting is
Rev. 2.00 Dec. 05, 2005 Page 462 of 724
REJ09B0200-0200
message identifier can be received by mailbox 1:
Identifier 1:
000_0000_0011 (0: Care, 1: Don't Care), a total of four kinds of message identifiers can be
received by mailbox 0:
Identifier 1:
Identifier 2:
Identifier 3:
Identifier 4:
010_1010_1010
010_1010_1000
010_1010_1001
010_1010_1010
010_1010_1011