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MC9S12XD256MAL Datasheet, PDF (436/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network | |||
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Chapter 10 Freescaleâs Scalable Controller Area Network (S12MSCANV3)
10.3.2.10 MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
The CANTAAK register indicates the successful abort of a queued message, if requested by the
appropriate bits in the CANTARQ register.
7
6
5
4
3
2
1
0
R
0
0
0
0
0
ABTAK2 ABTAK1 ABTAK0
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
NOTE
The CANTAAK register is held in the reset state when the initialization
mode is active (INITRQ = 1 and INITAK = 1).
Read: Anytime
Write: Unimplemented for ABTAKx ï¬ags
Table 10-14. CANTAAK Register Field Descriptions
Field
Description
2:0
ABTAK[2:0]
Abort Acknowledge â This ï¬ag acknowledges that a message was aborted due to a pending abort request
from the CPU. After a particular message buffer is ï¬agged empty, this ï¬ag can be used by the application
software to identify whether the message was aborted successfully or was sent anyway. The ABTAKx ï¬ag is
cleared whenever the corresponding TXE ï¬ag is cleared.
0 The message was not aborted.
1 The message was aborted.
10.3.2.11 MSCAN Transmit Buffer Selection Register (CANTBSEL)
The CANTBSEL register allows the selection of the actual transmit message buffer, which then will be
accessible in the CANTXFG register space.
7
6
5
4
3
2
1
0
R
0
0
0
0
0
TX2
TX1
TX0
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-14. MSCAN Transmit Buffer Selection Register (CANTBSEL)
MC9S12XDP512 Data Sheet, Rev. 2.21
436
Freescale Semiconductor
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