Fujitsu FR81S 사용자 설명서
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
73
5.3.5. Reception Message Object Setting
Reception message object setting is shown.
The initialization method for the reception message object is shown below:
Table 5-2 Reception Message Object Initialization
MsgVal Arb Data Mask EoB
Dir
NewDat MsgLst
RxIE TxIE IntPnd RmtEn TxRqst
1
appl. appl.
appl.
1
0
0
0
appl.
0
0
0
0
The IFx arbitration register (ID28 to 0 and Xtd bit) is provided by the application; and it defines the ID and
type of the reception message to be used in the acceptance filter.
ID28 to ID18 will be used and ID17 to ID0 will be disabled if standard frame (11-bit ID) has been set. ID17
to ID0 will be reset to "0" when a standard frame is received. ID28 to ID0 will be used if extended frame
(29-bit ID) has been set.
If the RxIE bit is set to "1", the IntPnd bit will be set to "1" when the reception data frame is stored to the
message object.
Data length code (DLC3 to 0) is provided by the application. Reception data length code and an 8-byte data
will be stored when the CAN controller stores the reception data frame to the message object. If the data
length code is less than 8 bytes, undefined data will be written to the remaining data of the message object.
When UMask="1", the IFx mask register (Msk28 to 0, UMask, MXtd and MDir bits) will be used to allow
the reception of the data frame having the ID that has been grouped by the mask setting. See the data frame
reception in "5.3 Message Reception Operation" for details.
Note:
The Dir bit of the IFx mask register cannot be set as a mask.
MB91520 Series
MN705-00010-1v0-E
1766