MC9S08DZ96F2CLL datasheet(269/458 Pages) FREESCALE

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Chapter 12 Freescale’s Controller Area Network (S08MSCANV1)

MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

269

12.3.9

MSCAN Transmitter Message Abort Acknowledge Register

(CANTAAK)

The CANTAAK register indicates the successful abort of messages queued for transmission, 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

12.3.10 MSCAN Transmit Buffer Selection Register (CANTBSEL)

The CANTBSEL selections of the actual transmit message buffer, which is accessible in the CANTXFG

76543210

00000

ABTAK2

ABTAK1

ABTAK0

Reset:

00000000

= Unimplemented

Figure 12-13. MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)

Table 12-14. 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 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.

76543210

00000

TX2

TX1

TX0

Reset:

00000000

= Unimplemented

Figure 12-14. MSCAN Transmit Buffer Selection Register (CANTBSEL)

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