Fujitsu FR81S User Manual
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
69
5.3.1. Reception Message Acceptance Filter
Reception message acceptance filter is shown.
When the arbitration/control field (ID + IDE + RTR + DLC) of the message is completely shifted to the
CAN controller reception shift register, scanning of message RAM for a match comparison with the valid
message object will be started.
The arbitration field and mask data (including MsgVal, UMask, NewDat and EoB) will be loaded from the
message object in message RAM at this time, and the arbitration fields of the message object and shift
register will be compared (including mask data).
This operation will be repeated until a match is detected between the arbitration fields of the message object
and shift register or until the final word of message RAM is reached. When a match is detected, scanning of
message RAM will be stopped and CAN controller will perform different processes according to the type of
the reception frame (data frame or remote frame).
MB91520 Series
MN705-00010-1v0-E
1762