MC68HC908AT32 Datasheet, PDF (276/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

MSCAN Controller
RXFIE — Receiver Full Interrupt Enable Bit
1 = A receive buffer full (successful message reception) event will result in a receive interrupt.
0 = No interrupt will be generated from this event.
23.13.7 MSCAN08 Transmitter Flag Register
All bits of this register are read and clear only. A flag can be cleared by writing a 1 to the corresponding
bit position. Writing a 0 has no effect on the flag setting. Every flag has an associated interrupt enable flag
in the CTCR register. A hard or soft reset will clear the register.
Address: $0506
Bit 7
6
5
4
3
Read: 0
ABTAK2 ABTAK1 ABTAK0
0
Write:
Reset: 0
0
0
0
0
= Unimplemented
2
TXE2
1
1
TXE1
1
Bit 0
TXE0
1
Figure 23-20. Transmitter Flag Register (CTFLG)
ABTAK2–ABTAK0 — Abort Acknowledge Flags
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.
The flag is reset implicitly whenever the associated TXE flag is set to 0.
1 = The message has been aborted.
0 = The message has not been aborted, thus has been sent out.
TXE2–TXE0 — Transmitter Empty Flags
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 will set the flag after the message has been
sent successfully. The flag also will be set by the MSCAN08 when the transmission request was
successfully aborted due to a pending abort request (see 23.12.5 Transmit Buffer Priority Registers).
If not masked, a receive interrupt is pending while this flag is set.
A reset of this flag also will reset the abort acknowledge (ABTAK) and the abort request (ABTRQ, (see
23.13.8 MSCAN08 Transmitter Control Register) flags of the particular buffer.
1 = The associated message buffer is empty (not scheduled).
0 = The associated message buffer is full (loaded with a message due for transmission).
MC68HC908AT32 Data Sheet, Rev. 3.1
276
Freescale Semiconductor