MSM9225 查看數據表（PDF） - Oki Electric Industry

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MSM9225

CAN (Controller Area Network) Controller

Oki Electric Industry 

¡ Semiconductor

MSM9225

FUNCTIONAL DESCRIPTION

Data Memory

Before starting communication, messages for communication and various control registers

must be set at the data memory.

Addresses X0hex to XDhex are the message memory, which stores control registers, identifiers

and the contents of each message.

In this address space, the higher 4 bits of an address corresponds to the number of messages,

and a maximum of 16 (0Xhex to FXhex) can be stored. Each message has an area to store a

maximum of 8 bytes of data memory, 1 byte of control register, and a maximum of 5 bytes of

an identifier.

This means that the data memory capacity for messages is: 16 messages ¥ (8 bytes for a message

+ 1 byte for a control register + 5 bytes for an identifier) = 224 bytes.

Addresses XEhex to XFhex are allocated to the control registers.

The configuration of data memory is as follows

Data memory configuration

Address

Function

A7 A6 A5 A4 A3 A2 A1 A0

0000

Corresponds to

0001

number of

0010

messages

0011

00000100

Ø

0101

11110110

0111

1000

1001

1010

1011

1100

1101

00001110

Ø

11111111

IDFM = 0 (standard)

IDFM = 1 (extended)

Message control register

Identifier 0

Identifier 1

Message 0

Identifier 2

Message 1

Identifier 3

Message 2

Identifier 4

Message 3

Message 0

Message 4

Message 1

Message 5

Message 2

Message 6

Message 3

Message 7

Message 4

—

Message 5

—

Message 6

—

Message 7

Various control registers

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