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FUJITSU MB91460 SERIES FR60 User Manual

Page 723

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Chapter 34 CAN Controller

2.Register Description

Function of the IFx Command Mask Register (IFxCMSK)

The other bits of IFx Command Mask Register have different functions depending on the transfer direction :

Direction = Write

[bit15-bit8]

res

Reserved Bits

[bit7]

WR/RD

Write / Read

0

Read: Transfer data from the Message Object addressed by the Command Request
Register into the selected Message Buffer Registers.

1

Write: Transfer data from the selected Message Buffer Registers to the Message
Object addressed by the Command Request Register.

[bit6]

Mask

Access Mask Bits

0

Mask bits unchanged.

1

Transfer Identifier Mask + MDir + MXtd to Message Object.

[bit5]

Arb

Access Arbitration Bits

0

Arbitration bits unchanged.

1

Transfer Identifier + Dir + Xtd + MsgVal to Message Object.

[bit4]

Control

Access Control Bits

0

Control Bits unchanged.

1

Transfer Control Bits to Message Object.

[bit3]

CIP

Clear Interrupt Pending Bit

When writing to a Message Object, this bit is ignored.

[bit2]

TxReq/

NewDat

Access Transmission Request Bit

0

TxRqst bit unchanged

1

set TxRqst bit

[bit1]

Data A

Access Data Bytes 0-3

0

Data Bytes 0-3 unchanged.

1

Transfer Data Bytes 0-3 to Message Object.

[bit0]

Data B

Access Data Bytes 4-7