Fujitsu FR81S User Manual
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
77
5.4.2. Message Reception by FIFO Buffer
Message reception by FIFO buffer is shown.
If the reception message matches the ID of the FIFO buffer, it will be stored to the reception message object
in the FIFO buffer having the smallest message number.
The NewDat bit of this reception message object will be set to "1" when the message is stored to the
reception message object in the FIFO buffer. When the NewDat bit is set to the reception message object
whose the EoB bit is "0", a write operation to the FIFO buffer by the CAN controller will not be performed
as the reception message object will be protected until the final reception message object (EoB bit = "1") is
reached.
If the NewDat bit of the reception message object is not written to "0" (release of write protection) while
valid data is stored up to the final FIFO buffer, the next reception message will be written to the final
message object, overwriting the previous message.
MB91520 Series
MN705-00010-1v0-E
1770