SH7052 datasheet(573/919 Pages) RENESAS

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Initialization (after Hardware Reset Only): These settings should be made while the HCAN is

in bit configuration mode.

1. IRR0 clearing

The reset interrupt flag (IRR0) is always set after a power-on reset or recovery from software

standby mode. As an HCAN interrupt is initiated immediately when interrupts are enabled,

IRR0 should be cleared.

2. HCAN pin port settings

To prevent erroneous identification of CAN bus data, HCAN pin port settings should be made

first. See section 15.3.2, HCAN Pin Port Settings, and section 18, Pin Function Controller, for

details.

3. Bit rate settings

Set values relating to the CAN bus communication speed and re-synchronization. See section

15.3.2, Bit Rate Settings, for details.

4. Mailbox transmit/receive settings

Each channel has one receive-only mailbox (mailbox 0) and 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. See section 15.3.2, Mailbox

Transmit/Receive Settings, for details.

5. 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 section 15.3.2, Mailbox (Message Control/Data (MCx[x], MDx[x]) Initial

Settings, for details.

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