mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 331

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

15.3.9
The CANTAAK register indicates the successful abort of messages queued for transmission, if requested
by the appropriate bits in the CANTARQ register.
Read: Anytime
Write: Unimplemented for ABTAKx flags
15.3.10 MSCAN Transmit Buffer Selection Register (CANTBSEL)
The CANTBSEL selections of the actual transmit message buffer, which is accessible in the CANTXFG
register space.
Freescale Semiconductor
ABTAK[2:0]
Field
2:0
Reset:
Reset:
W
W
R
R
Figure 15-12. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
MSCAN Transmitter Message Abort Acknowledge Register
(CANTAAK)
Abort Acknowledge — This flag acknowledges that a message was aborted due to a pending transmission
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 15-13. MSCAN Transmit Buffer Selection Register (CANTBSEL)
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
= Unimplemented
= Unimplemented
Table 15-14. CANTAAK Register Field Descriptions
6
0
0
6
0
0
0
0
0
0
5
5
NOTE
4
0
0
4
0
0
Description
0
0
0
0
3
3
Freescale’s Controller Area Network (MSCANV1)
ABTAK2
TX2
2
0
2
0
ABTAK1
TX1
0
0
1
1
ABTAK0
TX0
0
0
0
0
15-15