MSM9225 データシートの表示（PDF） - Oki Electric Industry

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コンポーネント説明

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MSM9225

CAN (Controller Area Network) Controller

Oki Electric Industry 

¡ Semiconductor

MSM9225

3. Number of messages specification register (NMES: 1Ehex)

This is a register to set the number of messages to be stored in the message memory.

A maximum of 16 messages can be set, with message numbers 0 to 15.

Writing to NMES is enabled when initialize bit INIT of the CAN control register (CANC:

OEhex) is "1".

At reset, NMES is set to "0000".

The bit configuration and relationship between message number and number of messages

are as follows:

Address MSB

1Eh * * * *

****

****

· ···

····

****

****

* : Don't Care

NMES3

0

0

·

·

1

1

NMES2

0

0

·

·

1

1

NMES1

0

0

·

·

1

1

LSB

NMES0

0

0

·

·

0

1

Number of message

1

2

·

·

15

16

4. CAN bus timing register 0 (BTR0: 1Fhex)

This register sets the baud rate prescaler and synchronization jump width (SJW) used for bus

timing. Writing to the BTR0 bit is enabled, when the INIT bit of the CAN control register

(CANC: 0Ehex) is "1".

The bit configuration is as follows:

Address MSB

LSB

1Fh

76543210

BRP0 :

BRP1 :

BRP2 :

BRP3 :

BRP4 :

BRP5 :

SJWA :

SJWB :

Baud rate

prescaler

Synchronization

Jump Width

16/73

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