MSM9225 Ver la hoja de datos (PDF) - Oki Electric Industry

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Fabricante

MSM9225

CAN (Controller Area Network) Controller

Oki Electric Industry 

¡ Semiconductor

MSM9225

(2) Transmission request: TRQ

When a message is transmitted, the microcontroller writes "1" to this bit. When

transmission ends normally, CAN writes "0". This means that the TRQ bit is "1" during

transmission. Therefore, to request transmission, confirm that the TRQ bit is "0" first,

then write "1" to the TRQ bit. When the remote frame is received while the ARES bit is

"1", the TRQ bit is set to "1".

At reset, the TRQ bit is set to "0".

(3) Receive status: RCS

When receiving completes, the RCS bit becomes "1". Write "0" to the RCS bit before the

microcontroller calls up receive data. When receiving the remote frame, the RCS bit

becomes "1" just after the reception.

At reset, the RCS bit is set to "0".

(4) Receive completion interrupt enable: EIR

The microcontroller sets interrupt request signal generation disable/enable when

receiving completes.

The EIR bit is valid when the EINTR bit of the CANI register is “1”.

At reset, the EIR bit is set to "0".

(5) Transmission completion interrupt enable: EIT

The microcontroller sets interrupt request signal generation disable/enable when

transmission completes.

The EIT bit is valid when the EINTT bit of the CANI register is “1”.

At reset, the EIT bit is set to "0".

(6) Message format setting: FRM

The microcontroller sets the format of the message to be sent/received. A message in a

format other than the specified format cannot be sent/received.

For the relationship between setting and format, see the table below.

When a message specified to a group message is received, the content of the RTR bit is

written.

At reset, the FRM bit is set to "0".

FRM

0

1

Message Type

Standard message

Group message

Standard message

Group message

Transmission Format

Data frame

Transmission disable

Remote frame

Transmission disable

Receive Format

Remote frame

Data frame

Data frame

Remote frame

(7) Automatic transmission : ARES

If the data frame is automatically transmitted after remote frame reception, the ARES bit

should be set to "1".

At reset, the ARES bit is set to "0".

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