mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 347

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC912DG128 — Rev 3.0
MOTOROLA
CTFLG
$0106
RESET
WARNING:
W
R
Bit 7
0
0
interrupt enable flag in the CTCR register. A hard or soft reset will reset
the register.
ABTAK2 – ABTAK0 — Abort Acknowledge
TXE2 – TXE0 —Transmitter Buffer Empty
To ensure data integrity, no registers of the transmit buffers should be written
to while the associated TXE flag is cleared.
ABTAK2
Freescale Semiconductor, Inc.
This flag acknowledges that a message has been aborted due to a
pending abort request from the CPU. After a particular message
buffer has been flagged empty, this flag can be used by the
application software to identify whether the message has been
aborted successfully or has been sent in the meantime. The ABTAKx
flag is cleared implicitly whenever the corresponding TXE flag is
cleared.
This flag indicates that the associated transmit message buffer is
empty, thus not scheduled for transmission. The CPU must
handshake (clear) the flag after a message has been set up in the
transmit buffer and is due for transmission. The msCAN12 sets the
flag after the message has been sent successfully. The flag is also set
by the msCAN12 when the transmission request was successfully
aborted due to a pending abort request
Control Register
pending while this flag is set.
Clearing a TXEx flag also clears the corresponding ABTAKx flag (see
above). When a TXEx flag is set, the corresponding ABTRQx bit is
cleared (see
6
0
For More Information On This Product,
0 = The massage has not been aborted, thus has been sent out.
1 = The message has been aborted.
0 = The associated message buffer is full (loaded with a message
1 = The associated message buffer is empty (not scheduled).
due for transmission).
ABTAK1
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5
0
msCAN12 Transmitter Control Register
MSCAN Controller
(CTCR)). If not masked, a transmit interrupt is
ABTAK0
4
0
3
0
0
Programmer’s Model of Control Registers
(msCAN12 Transmitter
TXE2
2
1
TXE1
1
1
MSCAN Controller
(CTCR)).
Technical Data
TXE0
Bit 0
1
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