PC912XDP512F0MPVR datasheet(435/1348 Pages) FREESCALE

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

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

435

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

10.3.2.9

MSCAN Transmitter Message Abort Request Register (CANTARQ)

The CANTARQ register allows abort request of queued messages as described below.

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 10-12. 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.

76543210

00000

ABTRQ2

ABTRQ1

ABTRQ0

Reset:

00000000

= Unimplemented

Figure 10-12. MSCAN Transmitter Message Abort Request Register (CANTARQ)

Table 10-13. 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 10.3.2.7, “MSCAN Transmitter Flag Register (CANTFLG)”) and abort acknowledge ﬂags (ABTAK, see

Section 10.3.2.10, “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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