mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 435

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Read: Anytime
Write: Anytime when not in initialization mode
10.3.2.9
The CANTARQ register allows abort request of queued messages as described below.
Read: Anytime
Write: Anytime when not in initialization mode
Freescale Semiconductor
ABTRQ[2:0]
TXEIE[2:0]
Field
Field
2:0
2:0
Reset:
W
R
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
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
Section 10.3.2.10, “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
Figure 10-12. MSCAN Transmitter Message Abort Request Register (CANTARQ)
MSCAN Transmitter Message Abort Request Register (CANTARQ)
request.
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).
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).
0
0
7
= Unimplemented
Table 10-13. CANTARQ Register Field Descriptions
Table 10-12. CANTIER Register Field Descriptions
0
0
6
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)
NOTE
NOTE
0
0
4
Description
Description
(CANTFLG)”) and abort acknowledge flags (ABTAK, see
3
0
0
ABTRQ2
0
2
(CANTAAK)”) are set and a
ABTRQ1
0
1
ABTRQ0
0
0
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