mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 348
mc68hc912dg128
Manufacturer Part Number
mc68hc912dg128
Description
M68hc12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC912DG128.pdf
(452 pages)
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MSCAN Controller
17.13.9 msCAN12 Transmitter Control Register (CTCR)
Technical Data
348
CTCR
$0107
RESET
W
R
NOTE:
NOTE:
NOTE:
Bit 7
0
0
The CTFLG register is held in the reset state if the SFTRES bit in
CMCR0 is set.
ABTRQ2 – ABTRQ0 — Abort Request
The software must not clear one or more of the TXE flags in CTFGL and
simultaneously set the respective ABTRQ bit(s).
TXEIE2 – TXEIE0 — Transmitter Empty Interrupt Enable
The CTCR register is held in the reset state when the SFTRES bit in
CMCR0 is set.
ABTRQ2
Freescale Semiconductor, Inc.
The CPU sets an ABTRQx bit to request that a scheduled message
buffer (TXEx = 0) shall be aborted. The msCAN12 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 and the Abort Acknowledge
flag (ABTAK, see
set and an TXE interrupt is generated if enabled. The CPU cannot
reset ABTRQx. ABTRQx is cleared implicitly whenever the
associated TXE flag is set.
6
0
For More Information On This Product,
0 = No abort request.
1 = Abort request pending.
0 = No interruptis generated from this event.
1 = A transmitter empty (transmit buffer available for transmission)
event results in a transmitter empty interrupt.
ABTRQ1
Go to: www.freescale.com
5
0
MSCAN Controller
msCAN12 Transmitter Flag Register
ABTRQ0
4
0
3
0
0
TXEIE2
MC68HC912DG128 — Rev 3.0
2
0
TXEIE1
1
0
(CTFLG)) are
MOTOROLA
TXEIE0
Bit 0
0
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