Fujitsu FR81S Manual Do Utilizador
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
72
5.3.4. Remote Frame
Remote frame is shown.
The following three processes are performed when the remote frame is received. The appropriate process
will be selected from the setting of the matching message object.
1. Dir="1" (Transmission direction), RmtEn="1", UMask="1" or "0"
The matched remote frame will be received, only the TxRqst bit of this message object will be set to
"1", and the automatic reply (transmission) of the data frame in response to the received remote
frame will be performed. (The message object will remain unchanged except for the TxRqst bit.)
2. Dir="1" (Transmission direction), RmtEn="0", UMask="0"
Remote frame will be disabled without receiving the message, even if the received remote frame
matches the message object. (the TxRqst bit of the message object will remain unchanged.)
3. Dir="1" (Transmission direction), RmtEn="0", UMask="1"
If the received remote frame matches the message object, the TxRqst bit of this message object will
be reset to "0", and the remote frame will be processed as a reception data frame. The received
arbitration field and control field (ID + IDE + RTR + DLC) will be stored to the message object in
message RAM, and the NewDat bit of this message object will be set to "1". Data field of the
message object will be unchanged.
MB91520 Series
MN705-00010-1v0-E
1765