h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 716

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 Controller Area Network (HCAN)
Rev. 6.00 Feb 22, 2005 page 656 of 1484
REJ09B0103-0600
Mailbox transmit/receive settings
Each channel has one receive-only mailbox (mailbox 0) plus 15 mailboxes that can be set for
reception. Thus a total of 32 mailboxes can be used for reception. To set a mailbox for
reception, set the corresponding bit to 1 in the mailbox configuration register (MBCR). The
initial setting for mailboxes is 0, designating transmission use. Refer to Mailbox
Transmit/Receive Settings in 16.3.2, Initialization after Hardware Reset, for details.
Mailbox (RAM) initialization
As message control/data registers (MCx[x], MDx[x]) are configured in RAM, their initial
values after powering on are undefined, and so bit initialization is necessary. Write 0s or 1s to
the mailboxes. See Mailbox (Message Control/Data (MCx[x], MDx[x]) Initial Setting in
16.3.2, Initialization after a Hardware Reset, for details.