Datasheet

Byte Data Link
MC9S12DP256 — Revision 1.1
Byte Data Link Controller Module
Figure 133 Transmitting A Type 3 IFR
Enter Type 3 IFR
Transmit Routine
Set desired
TMIFR bit in DLCBCR2
Is DLCBSVR = $00?
Yes
No
Load next byte to be
transmitted into DLCBDR
(clears TDRE)
Is DLCBSVR = $1C?
Yes
No
Is DLCBSVR = $14?
Yes
No
Is DLCBSVR = $10?
Yes
No
(TDRE)
(LOA)
(Invalid Symbol)
Is this the last
Yes
No
byte?
B
Jump to IFR
Receive Routine
Once BDLC detects
EOF, IFR transmit
Set TEOD bit
in DLCBCR2
attempt is complete
Exit Type 3 IFR
Transmit Routine
Abandon IFR
transmit attempt
For interrupt driven systems,
this marks the beginning of
the transmit Type 3 IFR
section of the BDLC interrupt
service routine
NOTE: The EOF and CRC Error interrupts
are handled in the IFR Receive Routine
Write first IFR
byte to be transmitted
into DLCBDR
Set TEOD bit in
Only one byte to
Yes
No
transmit?
DLCBCR2
A
B
A
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Freescale Semiconductor, Inc.
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