TMPR3916 datasheet(130/225 Pages) TOSHIBA

130 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-9

Abort Acknowledge Register (AA)

Bit

Name



Bit

Name

Function

Reset

Value

Mode



Wired to zero

14:0

If the transmission of the message in mailbox “n” has been aborted,

the bit “n” of this register will be set and a transmission abort

interrupt is generated, if it is enabled.

The bits in AA will be reset by writing a “1” from the MCU to AA or

TRS. Writing a “0” has no effect. After power-up, all bits are cleared.

R/C

Change Data Request (CDR)

Bit

Name



CDR

Bit

Name

Function

Reset

Value

Mode



Wired to zero

14:0

CDR

If the CDR bit of a transmit mailbox is set, a transmission request for

this mailbox will be ignored. That means, that a mailbox with TRS

and CDR set will not be considered in the internal arbitration-run:

the mailbox is locked for transmission. The processing of this

mailbox in the arbitration-run will be considered again after clearing

the CDR bit. After power-up, all bits are cleared.

R/W

CDR is useful for dealing with remote frames. It is intended for updating the data field of a transmit

mailbox, which is configured for automatic reply to remote frames (RFH bit set). By using the CDR bit,

the user can update the data field without a need of taking additional care of the data consistency.

See also section “7.5 Handling of Message-Objects”.

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