mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 759

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

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:
E—Empty
Bits 1, 7, 9–10, and 12—Reserved
These bits are reserved and must be set to 0.
NOTE:
OFFSET + 0
OFFSET + 2
OFFSET + 4
OFFSET + 6
• An error is detected.
• A full receive buffer is detected.
• The ENTER HUNT MODE command is issued.
• The CLOSE RX BD command is issued.
0 = The data buffer associated with this RX buffer descriptor has been filled with data
1 = The data buffer associated with this buffer descriptor is empty or currently receiving
You are only responsible for initializing the items in bold.
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.
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.
0
E
Note: The communication processor module sets all the status bits in this buffer
RES
1
descriptor, but you must clear them before submitting the buffer descriptor to the
communication processor module.
W
2
Freescale Semiconductor, Inc.
For More Information On This Product,
3
I
MPC823 REFERENCE MANUAL
4
L
Go to: www.freescale.com
F
5
RX DATA BUFFER POINTER
CM
6
DATA LENGTH
RES
7
DE
8
RESERVED
9
Communication Processor Module
10
NO
11
RES
12
CR
13
OV
14
16-307
CD
15