Address
SCC Base+46
Zero
SCC Base+48
Reserved
SCC Base+4A
RFTHR
SCC Base+4C
Reserved
SCC Base+4E
Reserved
SCC Base+50
TXCTL_TBL
SCC Base+54
RXCTL_TBL
SCC Base+58
SCC Base+5A
Note: Entries in boldface must be initialized by the user.
Reserved
These areas are temporary storage locations for the microcode. They need not be initial-
ized and should never be modified.
C_MASK
This value should be initialized with $0000F0B8.
C_PRES
This value should be initialized with $0000FFFF.
Zero
This field must be set to zero by the user.
RFTHR
Received Frames Threshold. This indicates how many frames will be received before the
RXF bit is set in the event register.
TXCTL_TBL
Transmit Control Character Table. This stores the bit array used for the TX Control Char-
acter Table. Each bit corresponds to a character that should be mapped according to RFC
1549. If the bit is set, the character corresponding to that bit will be mapped. If the bit is
not set, the character corresponding to that bit will not be mapped.
31
30
29
28
0x1F
0x1E
0x1D
0x1C
RXCTL_TBL
Receive Control Character Table. This stores the bit array used for the RX Control Char-
acter Table. Each bit corresponds to a character that should be mapped according to RFC
1549. If the bit is set, the character corresponding to that bit will be discarded if received.
If the bit is not set, the character corresponding to that bit will be received normally.
31
30
29
28
0x1F
0x1E
0x1D
0x1C
MOTOROLA
Freescale Semiconductor, Inc.
Table 1. ASYNC HDLC-Specific Parameters
Name
Width
Word
Word
Word
Word
Word
Long
Long
Word
Word
27
26
25
0x1B
0x1A
0x19
27
26
25
0x1B
0x1A
0x19
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Description
Must be initialized to zero by user
Received Frames Threshold
TX Control Character Mapping Table
RX Control Character Mapping Table
5
4
................
0x05
0x04
5
4
................
0x05
0x04
Asynchronous HDLC
3
2
1
0
0x03
0x02
0x01
0x00
3
2
1
0
0x03
0x02
0x01
0x00
10