Datasheet

Byte Data Link Controller Module
Transmitting An In-Frame Response (IFR)
MC9S12DP256 — Revision 1.1
Byte Data Link Controller Module
Transmitting a
Type 3 IFR
Transmitting a Type 3 IFR, with or without a CRC byte, is done in a
fashion similar to transmitting a message frame. The user loads the first
byte to be transmitted into the DLCBDR and then sets the appropriate
TMIFR bit, depending upon whether a CRC byte is desired. When the
Figure 132 Transmitting A Type 2 IFR
Enter Type 2 IFR
Transmit Routine
Is DLCBSVR = $1C?
No
Yes
Load IFR byte
into DLCBDR
(Error Detected)
Set TSIFR in DLCBCR2
Once BDLC detects,
or EOF, IFR transmit
attempt is complete
Is DLCBSVR = $14?
No
Yes
(LOA)
Exit Type 1 IFR
Transmit Routine
Jump to Receive IFR
Handling Routine
IFR byte is discarded IFR byte is discarded
Was this the last
No
Yes
transmit attempt?
Was the 11th
No
Yes
msg byte received?
Set TEOD in DLCBCR2
Jump to Receive IFR
Handling Routine
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