MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 498

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale’s Scalable Controller Area Network (S12MSCANV3)
16.3.2.10 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.
1
16.3.2.11 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.
498
Module Base + 0x0009
ABTRQ[2:0]
ABTAK[2:0]
Read: Anytime
Write: Unimplemented
Field
Field
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
2-0
2-0
Reset:
W
R
Figure 16-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)
Abort Request — The CPU sets the ABTRQx bit to request that a scheduled message buffer (TXEx = 0) be
aborted. The MSCAN grants the request if the message has not already started transmission, or if the
transmission is not successful (lost arbitration or error). When a message is aborted, the associated TXE (see
Section 16.3.2.7, “MSCAN Transmitter Flag Register
Section 16.3.2.10, “MSCAN Transmitter Message Abort Acknowledge Register
transmit interrupt occurs if enabled. The CPU cannot reset ABTRQx. ABTRQx is reset whenever the associated
TXE flag is set.
0 No abort request
1 Abort request pending
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
7
= Unimplemented
Table 16-15. CANTARQ Register Field Descriptions
Table 16-16. CANTAAK Register Field Descriptions
0
0
6
MC9S12G Family Reference Manual,
0
0
5
NOTE
0
0
4
Description
Description
(CANTFLG)”) and abort acknowledge flags (ABTAK, see
0
0
3
Rev.1.01
ABTAK2
2
0
(CANTAAK)”) are set and a
Freescale Semiconductor
Access: User read/write
ABTAK1
0
1
ABTAK0
0
0
1