SH7055S Datasheet, PDF(608/1002 Page) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

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SH7055S Datasheet, PDF (608/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

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Interrupt and Receive Message Settings: When mailbox initialization is finished, CPU interrupt

source settings and receive message specifications must be made. Interrupt source are set in the

mailbox interrupt mask register (MBIMR) and interrupt mask register (IMR). To receive a

message, the identifier must be set in advance in the message control (MCx[1] to MCx[8]) for the

receiving mailbox. When a message is received, all the bits in the receive message identifier are

compared, and if a 100% match is found, the message is stored in the matching mailbox. Mailbox

0 (MC0[x], MD0[x]) has a local acceptance filter mask (LAFM) that allows Donât Care settings to

be made.

1. CPU interrupt source settings

When transmitting, transmission acknowledge and transmission abort acknowledge interrupts

can be masked for individual mailboxes in the mailbox interrupt mask register (MBIMR).

When receiving, data frame and remote frame receive wait interrupts can be masked. Interrupt

register (IRR) interrupts can be masked in the interrupt mask register (IMR).

2. Arbitration field setting

In the arbitration field, the identifier (STD_ID0 to STD_ID10, EXT_ID0 to EXT_ID17) of the

message to be received is set. If all the bits in the set identifier do not match, the message is

not stored in a mailbox.

Example: Mailbox 1

010_1010_1010 (standard identifier)

Only one kind of message identifier can be received by MB1

Identifier 1: 010_1010_1010

3. Local acceptance filter mask (LAFM) setting

The local acceptance filter mask is provided for mailbox 0 (MC0[x], MD0[x]) only, enabling a

Donât Care specification to be made for all bits in the received identifier. This allows various

kinds of messages to be received.

Example: Mailbox 0

010_1010_1010 (standard identifier)

LAFM

000_0000_0011 (0: Care, 1: Donât Care)

A total of four kinds of message identifiers can be received by MB0

Identifier 1: 010_1010_1000

Identifier 2: 010_1010_1001

Identifier 3: 010_1010_1010

Identifier 4: 010_1010_1011

Rev.2.0, 07/03, page 570 of 960

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