MC9S12HZ256 Datasheet, PDF (350/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 12 Freescale’s Scalable Controller Area Network (MSCANV2)
12.3.2.10 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 12-11. 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 flags
Table 12-16. CANTAAK Register Field Descriptions
Field
Description
2:0
ABTAK[2:0]
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.
MC9S12HZ256 Data Sheet, Rev. 2.04
350
Freescale Semiconductor