Communication Processor Module
16-310 MPC823e REFERENCE MANUAL MOTOROLA
COMMUNICATION
16
SCCs
16.9.21.9 SCCx TRANSPARENT RECEIVE BUFFER DESCRIPTOR. The
communication processor module reports information about the received data for each
buffer using a channel’s receive (RX) buffer descriptor, closes the current buffer, generates
a maskable interrupt, and starts receiving data into the next buffer after one of the following
events occurs:
• An error is detected.
• A full receive buffer is detected.
• The ENTER HUNT MODE command is issued.
• The CLOSE RX BD command is issued.
E—Empty
0 = The data buffer associated with this RX buffer descriptor has been filled with data
or has stopped receiving data because an error occurred. The core is free to
examine or write to any fields of this RX buffer descriptor. The communication
processor module does not use this buffer descriptor when the E bit is zero.
1 = The data buffer associated with this buffer descriptor is empty or currently receiving
data. This RX buffer descriptor and its associated receive buffer are owned by the
communication processor module. Once the E bit is set, the core must not write
any fields of this RX buffer descriptor.
Bits 1, 7, 9–10, and 12—Reserved
These bits are reserved and must be set to 0.
Note: The communication processor module sets all the status bits in this buffer
descriptor, but you must clear them before submitting the buffer descriptor to the
communication processor module.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OFFSET + 0
E RES WI LFCM RES DE RESERVED NO RES CR OV CD
OFFSET + 2
DATA LENGTH
OFFSET + 4
RX DATA BUFFER POINTER
OFFSET + 6
NOTE: You are only responsible for initializing the items in bold.
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