MC9S12HY64 Datasheet, PDF (325/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Freescale’s Scalable Controller Area Network (S12MSCANV3)
9.3.2.10 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.
Module Base + 0x0009
Access: User read/write⁽¹⁾
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 9-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
1. Read: Anytime
Write: Unimplemented
NOTE
The CANTAAK register is held in the reset state when the initialization
mode is active (INITRQ = 1 and INITAK = 1).
Table 9-16. 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.
9.3.2.11 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.
Module Base + 0x000A
Access: User read/write⁽¹⁾
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 9-14. MSCAN Transmit Buffer Selection Register (CANTBSEL)
1. Read: Find the lowest ordered bit set to 1, all other bits will be read as 0
Write: Anytime when not in initialization mode
MC9S12HY/HA-Family Reference Manual Rev. 1.04
Freescale Semiconductor
325