Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 308 of 556
REJ09B0026-0400
15.3.8 Transmit Pending Cancel Register (TXCR)
TXCR cancels transmission of transmit pending messages in Mailboxes. By setting the TXCR bit
correspondent to TXPR, TXPR is cleared to 0. If the transmission has been canceled successfully,
the corresponding bits in both TXPR and TXCR are cleared to 0 and then the corresponding bit in
ABACK is set. Writing 0 to the bit in TXCR is ignored.
Bit Bit Name
Initial
Value R/W Description
7 to 4 — All 0 — Reserved
These bits are always read as 0.
3
2
1
MB3
MB2
MB1
0
0
0
R/W
R/W
R/W
[Setting condition]
The corresponding bit of a mailbox is set to 1
[Clearing condition]
When the corresponding bit in TXPR is cleared (the
transmit message is canceled successfully)
Note: Writing 1 to these bits is enabled only when the
TXPR bit corresponding to Mailbox is set to 1.
0 — 0 — Reserved
This bit is always read as 0. This bit is relevant to the
receive-only Mailbox, and its value cannot be changed.
15.3.9 Transmit Acknowledge Register (TXACK)
TXACK is a status flag that indicates the successful transmit completion of Mailbox transmit
messages.
Bit Bit Name
Initial
Value R/W Description
7 to 4 — All 0 — Reserved
These bits are always read as 0.
3
2
1
MB3
MB2
MB1
0
0
0
R/(W)*
R/(W)*
R/(W)*
[Setting condition]
When transmission of the message in the corresponding
Mailbox has completed successfully
[Clearing condition]
When 1 is written to these bits