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Chapter 34 CAN Controller
2.Register Description
(Note) If a transmission is requested by programming bit TxRqst/NewDat in the IFx Command Mask
Register, bit TxRqst in the IFx Message Control Register will be ignored.
• Direction = Read
(Note) A read access to a Message Object can be combined with the reset of the control bits IntPnd and
NewDat. The values of these bits transferred to the IFx Message Control Register always reflect the
status before resetting these bits.
■ IFx Mask Registers (IFxMSK)
The bits of the Message Buffer registers mirror the Message Objects in the Message RAM.
0 Data Bytes 4-7 unchanged.
1 Transfer Data Bytes 4-7 to Message Object.
[bit6] Mask Access Mask Bits
0 Mask bits unchanged.
1 Transfer Identifier Mask + MDir + MXtd to IFx Message Buffer Register.
[bit5] Arb Access Arbitration Bits
0 Arbitration bits unchanged.
1 Transfer Identifier + Dir + Xtd + MsgVal to IFx Message Buffer Register.
[bit4] Control Access Control Bits
0 Control Bits unchanged.
1 Transfer Control Bits to IFx Message Buffer Register.
[bit3] CIP Clear Interrupt Pending Bit
0 IntPnd bit remains unchanged.
1 Clear IntPnd bit in the Message Object.
[bit2] TxReq/
NewDat
Access New Data Bit
0 NewDat bit remains unchanged.
1 Clear NewDat bit in the Message Object.
[bit1] Data A Access Data Bytes 0-3
0 Data Bytes 0-3 unchanged.
1 Transfer Data Bytes 0-3 to IFx Message Buffer Register.
[bit0] Data B Access Data Bytes 4-7
0 Data Bytes 4-7 unchanged.
1 Transfer Data Bytes 4-7 to IFx Message Buffer Register.