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| 型號： | MSM9225GA-2K |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44 |
| 封裝： | 9 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 73/74頁 |
| 文件大小： | 487K |
| 代理商： | MSM9225GA-2K |
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Semiconductor
MSM9225
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(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
Message Type
Transmission Format
Receive Format
0
1
Standard message
Data frame
Remote frame
Group message
Transmission disable
Data frame
Remote frame
Transmission disable
Data frame
Remote frame
Standard message
Group message
(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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