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
44
TxIE: Transmission interrupt flag enable bit
TxIE
Function
0
The IntPnd remains unchanged after successful frame transmission.
1
The IntPnd is set to "1" after successful frame transmission.
IntPnd: Interrupt pending bit
IntPnd
Function
0
No interrupt factor exists.
1
Interrupt factor exists.
If no other high priority interrupt exists, the IntId bit of the CAN interrupt register
(INTR) will indicate this message object.
RmtEn: Remote enable
RmtEn
Function
0
The TxRqst remains unchanged by remote frame reception.
1
The TxRqst will be set to "1" if a remote frame is received while the Dir bit is "1".
Notes:
⋅
When the Dir bit is "1" and the RmtEn bit is "0", it will operate differently depending on the UMask
setting.
⋅
If the UMask is "1", the TxRqst bit will be reset to "0" when the remote frame is received through the
acceptance filter. At this time, the received ID, IDE, RTR and DLC will be stored in the message
object, the NewDat bit will be set to "1", and the data will remain unchanged (treated as a data
frame).
⋅
If the UMask is "0", the TxRqst bit will remain unchanged by the remote frame reception; and it will
ignore the remote frame.
TxRqst: Transmission request bits
TxRqst
Function
0
Indicates the transmission idle state (neither transmission is in progress nor in the
transmission wait state).
1
Indicates that transmission is in progress or in the transmission wait state.
DLC3 to DLC0: Data length code
DLC3 to 0
Function
0 to 8
Data frame length is 0 to 8 bytes.
9 to 15
Setting prohibited.
If set, it will be 8 bytes in length.
MB91520 Series
MN705-00010-1v0-E
1737