Motorola MPC860 PowerQUICC User Manual page 676

Part V. The Communications Processor Module
E
Status 0
Length
Pointer
E
Status 0
Length
Pointer
E
Status 0
Length
Pointer
E
Status 1
Length
Pointer
10 Characters
Characters
Received by UART
Time
Figure 23-7. SCC UART Receiving using RxBDs
23-16
Rx BD 0
ID
0
0008
32-Bit Buffer Pointer
Rx BD 1
ID
1
0002
32-Bit Buffer Pointer
Rx BD 2
ID FR
0 1
0004
32-Bit Buffer Pointer
Rx BD 3
XXXX
32-Bit Buffer Pointer
MPC860 PowerQUICC UserÕs Manual
MRBLR = 8 Bytes for this SMC
Buffer
Byte 1
Byte 2
Buffer Full
etc.
Byte 8
Buffer
Byte 9
Byte 10
Idle Time-Out
Occurred
Empty
Buffer
Byte 1
Byte 2
Byte 4 has
Byte 3
Framing Error
Byte 4 Error!
Empty
Buffer
Byte 5
Additional Bytes
will be Stored Unless
Reception
Idle Count Expires
Still in Progress
(MAX_IDL)
with this Buffer
Long Idle Period
8 Bytes
8 Bytes
8 Bytes
8 Bytes
5 Characters
Fourth Character Present
has Framing Error! Time
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