MC9S08DZ96F2CLL datasheet(268/458 Pages) FREESCALE

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Chapter 12 Freescale’s Controller Area Network (S08MSCANV1)

MC9S08DZ128 Series Data Sheet, Rev. 1

268

Freescale Semiconductor

NOTE

The CANTIER register is held in the reset state when the initialization mode

is active (INITRQ = 1 and INITAK = 1). This register is writable when not

in initialization mode (INITRQ = 0 and INITAK = 0).

Read: Anytime

Write: Anytime when not in initialization mode

12.3.8

MSCAN Transmitter Message Abort Request Register (CANTARQ)

The CANTARQ register allows abort request of messages queued for transmission.

NOTE

The CANTARQ register is held in the reset state when the initialization

mode is active (INITRQ = 1 and INITAK = 1). This register is writable when

not in initialization mode (INITRQ = 0 and INITAK = 0).

Read: Anytime

Write: Anytime when not in initialization mode

Table 12-12. CANTIER Register Field Descriptions

Field

Description

2:0

TXEIE[2:0]

Transmitter Empty Interrupt Enable

0 No interrupt request is generated from this event.

1 A transmitter empty (transmit buffer available for transmission) event causes a transmitter empty interrupt

request. See Section 12.5.2.2, “Transmit Structures” for details.

76543210

00000

ABTRQ2

ABTRQ1

ABTRQ0

Reset:

00000000

= Unimplemented

Figure 12-12. MSCAN Transmitter Message Abort Request Register (CANTARQ)

Table 12-13. CANTARQ Register Field Descriptions

Field

Description

2:0

ABTRQ[2:0]

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 12.3.6, “MSCAN Transmitter Flag Register (CANTFLG)”) and abort acknowledge ﬂags (ABTAK, see

Section 12.3.9, “MSCAN Transmitter Message Abort Acknowledge Register (CANTAAK)”) are set and a 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

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