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參數(shù)資料
| 型號： | ML9620GAZ210 |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 39/79頁 |
| 文件大?。?/td> | 449K |
| 代理商： | ML9620GAZ210 |
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ML9620 User’s Manual
Chapter 3
Operational Description
3 - 4
3.3.3 Acceptance Filtering of Received Messages
When the arbitration and control field (Identifier + IDE + RTR + DLC) of an incoming message is completely
shifted into the RX/TX Shift Register of the CAN Control, the Message Handler FSM starts the scanning of the
Message RAM for a matching valid Message Object.
To scan the Message RAM for a matching Message Object, the Acceptance Filtering unit is loaded with the
arbitration bits from the CAN Control shift register.
Then the arbitration and mask fields (including MsgVal,
UMask, NewDat, and EoB) of Message Object 1 are loaded into the Acceptance Filtering unit and compared with
the arbitration field from the shift register.
This is repeated with each following Message Object until a matching
Message Object is found or until the end of the Message RAM is reached.
If a match occurs, the scanning is stopped and the Message Handler FSM proceeds depending on the type of frame
(Data Frame or Remote Frame) received.
3.3.3.1
Reception of Data Frame
The Message Handler FSM stores the message from the CAN Control shift register into the respective Message
Object in the Message RAM.
Not only the data bytes, but all arbitration bits and the Data Length Code are stored
into the corresponding Message Object.
This is implemented to keep the data bytes connected with the identifier
even if arbitration mask registers are used.
The NewDat bit is set to indicate that new data (not yet seen by the MCU) has been received.
The MCU should
reset NewDat when it reads the Message Object.
If at the time of the reception the NewDat bit was already set,
MsgLst is set to indicate that the previous data (supposedly not seen by the MCU) is lost.
If the RxIE bit is set,
the IntPnd bit is set, causing the Interrupt Register to point to this Message Object.
The TxRqst bit of this Message Object is reset to prevent the transmission of a Remote Frame, while the requested
Data Frame has just been received.
3.3.3.2
Reception of Remote Frame
When a Remote Frame is received, three different configurations of the matching Message Object have to be
considered:
1) Dir = ‘1’ (direction = transmit), RmtEn = ‘1’, UMask = ‘1’ or ’0’
At the reception of a matching Remote Frame, the TxRqst bit of this Message Object is set.
The rest of the
Message Object remains unchanged.
2) Dir = ‘1’ (direction = transmit), RmtEn = ‘0’, UMask = ’0’
At the reception of a matching Remote Frame, the TxRqst bit of this Message Object remains unchanged; the
Remote Frame is ignored.
3) Dir = ‘1’ (direction = transmit), RmtEn = ‘0’, UMask = ’1’
At the reception of a matching Remote Frame, the TxRqst bit of this Message Object is reset.
The arbitration
and control field (Identifier + IDE + RTR + DLC) from the shift register is stored into the Message Object in
the Message RAM and the NewDat bit of this Message Object is set.
The data field of the Message Object
remains unchanged; the Remote Frame is treated similar to a received Data Frame.
3.3.4 Receive / Transmit Priority
The receive/transmit priority for the Message Objects is attached to the message number.
Message Object 1 has
the highest priority, while Message Object 32 has the lowest priority.
If more than one transmission request is
pending, they are serviced due to the priority of the corresponding Message Object.
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