Fujitsu FR81S ユーザーズマニュアル
CHAPTER 41: CAN
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
42
ID28 to ID0: Message ID
ID
Function
ID28 to ID0 Instructs a 29-bit ID (extended frame).
ID28 to
ID18
Instructs an 11-bit ID (standard frame).
Msk28 to Msk0: ID Mask
Msk
Function
0
Masks the bit corresponding to the message object ID.
1
Does not mask the bit corresponding to the message object ID.
Xtd: Extended ID enable bit
Xtd
Function
0
An 11-bit ID (standard frame) is used for the message object.
1
A 29-bit ID (extended frame) is used for the message object.
MXtd: Extended ID mask bit
MXtd
Function
0
Does not compare the values between those set to the Xtd of the message object and
those for the IDE bit in the received frame. The IDE in the received frame determines
whether to compare it as a standard frame ID or an extended frame ID.
1
Compares the values between those set to the Xtd of the message object and those for
the IDE in the received frame.
Note:
If an 11-bit ID (standard frame) is set to the message object, ID of the received data frame will be written to
ID28 to ID18. Msk28 to Msk18 are used for ID masks.
Dir: Message direction bit
Dir
Function
0
Indicates the reception direction.
The remote frame will be transmitted when the TxRqst is set to "1", and the data frame
that has passed through the acceptance filter will be received when TxRqst is set to "0".
1
Indicates the transmission direction.
Data frame will be transmitted when the TxRqst is set to "1". If the TxRqst is "0" and
the RmtEn is set to "1", the CAN controller itself sets its the TxRqst bit to "1" by
receiving the remote frame that has passed through the acceptance filter.
MB91520 Series
MN705-00010-1v0-E
1735