Datasheet

Byte Data Link Controller Module
Transmitting An In-Frame Response (IFR)
MC9S12DP256 — Revision 1.1
Byte Data Link Controller Module
Step 1: Load the
IFR Byte into the
BDR
As with the Type 1 IFR, the user begins initiation of a Type 2 IFR by
loading the desired IFR byte into the DLCBDR. If a byte has already
been written into the DLCBDR for transmission as a new message, the
user can simply write the IFR byte to the DLCBDR, replacing the
previously written byte. This must be done before the first EOD symbol
is received.
Figure 131 Transmitting A Type 1 IFR
Enter Type 1 IFR
Transmit Routine
Is DLCBSVR = $1C?
No
Yes
Load IFR byte
into DLCBDR
(Error Detected)
Set TSIFR and TEOD
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
Load IFR byte
into DLCBDR
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Freescale Semiconductor, Inc.
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