MC68HC08AZ60 Datasheet, PDF (347/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
MSCAN Controller (MSCAN08)
Programmer’s Model of Control Registers
TXE2–TXE0 — Transmitter Empty
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 MSCAN08 sets the
flag after the message has been sent successfully. The flag is also set
by the MSCAN08 when the transmission request was successfully
aborted due to a pending abort request (see Transmit Buffer
Priority Registers on page 334). If not masked, a receive interrupt is
pending while this flag is set.
Clearing a TXEx flag also clears the corresponding ABTAKx flag
(ABTAK, see above). When a TXEx flag is set, the corresponding
ABTRQx bit (ABTRQ, see MSCAN08 Transmitter Control Register
on page 348) is cleared.
1 = The associated message buffer is empty (not scheduled).
0 = The associated message buffer is full (loaded with a message
due for transmission).
NOTE: To ensure data integrity, no registers of the transmit buffers should be
written to while the associated TXE flag is cleared.
NOTE: The CTFLG register is held in the reset state when the SFTRES bit in
CMCR0 is set.
43-mscan
MOTOROLA
MC68HC08AZ60 — Rev 1.0
MSCAN Controller (MSCAN08)
347
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