mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 436

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 10 Freescale’s 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.
Read: Anytime
Write: Unimplemented for ABTAKx flags
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.
436
ABTAK[2:0]
Field
2:0
Reset:
Reset:
W
W
R
R
Figure 10-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
Abort Acknowledge — This flag acknowledges that a message was aborted due to a pending abort request
from the CPU. After a particular message buffer is flagged empty, this flag can be used by the application
software to identify whether the message was aborted successfully or was sent anyway. The ABTAKx flag is
cleared whenever the corresponding TXE flag is cleared.
0 The message was not aborted.
1 The message was aborted.
The CANTAAK register is held in the reset state when the initialization
mode is active (INITRQ = 1 and INITAK = 1).
0
0
0
0
7
7
Figure 10-14. MSCAN Transmit Buffer Selection Register (CANTBSEL)
= Unimplemented
= Unimplemented
Table 10-14. CANTAAK Register Field Descriptions
0
0
0
0
6
6
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
0
0
5
5
NOTE
0
0
0
0
4
4
Description
3
0
0
3
0
0
ABTAK2
TX2
0
0
2
2
Freescale Semiconductor
ABTAK1
TX1
0
0
1
1
ABTAK0
TX0
0
0
0
0