MC68302 Datasheet, PDF (453/480 Pages) Motorola, Inc – Integrated Multiprotocol Processor User’s Manual

SCC Programming Reference
Table E-1. (a)Transparent Programming Model
Receive and Transmit Buffer Descriptors for SCCx
Initialized Offset
by User
Hex
Name
Initialized Offset
by User
Hex
Name
Yes
00 Rx BD 0 Control/Status
Yes
40 Tx BD 0 Control/Status
02 Rx BD 0 Data Count
Yes
42 Tx BD 0 Data Count
Yes
04 Rx BD 0 Data Pointer (High Word)
Yes
44 Tx BD 0 Data Pointer (High Word)
Yes
06 Rx BD 0 Data Pointer (Low Word)
Yes
46 Tx BD 0 Data Pointer (Low Word)
Yes
08 Rx BD 1 Control/Status
Yes
48 Tx BD 1 Control/Status
0A Rx BD 1 Data Count
Yes
4A Tx BD 1 Data Count
Yes
0C Rx BD 1 Data Pointer (High Word) Yes
4C Tx BD 1 Data Pointer (High Word)
Yes
0E Rx BD 1 Data Pointer (Low Word)
Yes
4E Tx BD 1 Data Pointer (Low Word)
Yes
10 Rx BD 2 Control/Status
Yes
50 Tx BD 2 Control/Status
12 Rx BD 2 Data Count
Yes
52 Tx BD 2 Data Count
Yes
14 Rx BD 2 Data Pointer (High Word) Yes
54 Tx BD 2 Data Pointer (High Word)
Yes
16 Rx BD 2 Data Pointer (Low Word)
Yes
56 Tx BD 2 Data Pointer (Low Word)
Yes
18 Rx BD 3 Control/Status
Yes
58 Tx BD 3 Control/Status
1A Rx BD 3 Data Count
Yes
5A Tx BD 3 Data Count
Yes
1C Rx BD 3 Data Pointer (High Word) Yes
5C Tx BD 3 Data Pointer (High Word)
Yes
1E Rx BD 3 Data Pointer (Low Word)
Yes
5E Tx BD 3 Data Pointer (Low Word)
Yes
20 Rx BD 4 Control/Status
Yes
60 Tx BD 4 Control/Status
22 Rx BD 4 Data Count
Yes
62 Tx BD 4 Data Count
Yes
24 Rx BD 4 Data Pointer (High Word) Yes
64 Tx BD 4 Data Pointer (High Word)
Yes
26 Rx BD 4 Data Pointer (Low Word)
Yes
66 Tx BD 4 Data Pointer (Low Word)
Yes
28 Rx BD 5 Control/Status
Yes
68 Tx BD 5 Control/Status
2A Rx BD 5 Data Count
Yes
6A Tx BD 5 Data Count
Yes
2C Rx BD 5 Data Pointer (High Word) Yes
6C Tx BD 5 Data Pointer (High Word)
Yes
2E Rx BD 5 Data Pointer (Low Word)
Yes
6E Tx BD 5 Data Pointer (Low Word)
Yes
30 Rx BD 6 Control/Status
Yes
70 Tx BD 6 Control/Status
32 Rx BD 6 Data Count
Yes
72 Tx BD 6 Data Count
Yes
34 Rx BD 6 Data Pointer (High Word) Yes
74 Tx BD 6 Data Pointer (High Word)
Yes
36 Rx BD 6 Data Pointer (Low Word)
Yes
76 Tx BD 6 Data Pointer (Low Word)
Yes
38 Rx BD 7 Control/Status
Yes
78 Tx BD 7 Control/Status
3A Rx BD 7 Data Count
Yes
7A Tx BD 7 Data Count
Yes
3C Rx BD 7 Data Pointer (High Word)
Yes
7C Tx BD 7 Data Pointer (High Word)
Yes
3E Rx BD 7 Data Pointer (Low Word)
Yes
7E Tx BD 7 Data Pointer (Low Word)
NOTE: The offset is from the MC68302 base address + ($400 for SCC1, $500 for SCC2, or $600 for SCC3)
.
Table E-1 (b). Transparent Programming Model (Continued)
General Parameter and Transparent Protocol-Specific RAM for SCCx
Initialized Offset
by User
Hex
Name
Initialized by Offset
User
Hex
Name
Yes
80
RFCR
TFCR
A2
Reserved
Yes
82
MRBLR
A4
Reserved
84
Rx Internal State
A6
Reserved
86
Reserved
Rx Internal Buffer No.
A8
Reserved
88
Rx Internal Data Pointer (High Word)
8A
Rx Internal Data Pointer (Low Word)
AA
Reserved
8C
Rx Internal Byte Count
AC
Reserved
8E
Rx Temp
AE
Reserved
90
Tx Internal State
B0
Reserved
92
Reserved
Tx Internal Buffer No.
B2
Reserved
94
Tx Internal Data Pointer (High Word)
96
TX Internal Data Pointer (Low Word)
B4
Reserved
98
Tx Internal Byte Count
B6
Reserved
9A
Tx Temp
B8
Reserved
9C
Reserved
BA
Reserved
9E
Reserved
BC
Reserved
A0
Reserved
BE
Reserved
NOTE: The offset is from the MC68302 base address + ($400 for SCC1, $500 for SCC2, or $600 for SCC3).
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MC68360 USER’S MANUAL
E-31