P912XDP512F0MFVR datasheet(436/1350 Pages) FREESCALE

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)

MC9S12XDP512 Data Sheet, Rev. 2.17

436

Freescale Semiconductor

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.

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

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.

76543210

00000

ABTAK2

ABTAK1

ABTAK0

Reset:

00000000

= Unimplemented

Figure 10-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)

Table 10-14. 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.

76543210

00000

TX2

TX1

TX0

Reset:

00000000

= Unimplemented

Figure 10-14. MSCAN Transmit Buffer Selection Register (CANTBSEL)

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