mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 918

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

Communication Processor Module
EN—Enable I
This bit enables I
consumes minimal power.
16.13.7.2 I
the communication processor module reports information about each buffer of received
data, closes the current buffer, generates a maskable interrupt, and starts receiving data in
the next buffer when the current buffer is full. In addition, it closes the buffer when a stop or
start condition is found on the I
The first word of the RX buffer descriptor contains status and control bits, which you prepare
before reception and then the communication processor module sets them after the buffer
is closed. The second word contains the data length (in bytes) that is received and the third
and fourth words contain a pointer that always points to the beginning of the received data
buffer. The core writes these RX buffer descriptor bits before the I
OFFSET + 0
OFFSET + 2
OFFSET + 4
OFFSET + 6
NOTE:
0 = I
1 = I
You are only responsible for initializing the items in bold.
2
2
0
E
C controller is disabled.
C controller is enabled.
2
C RECEIVE BUFFER DESCRIPTOR. Using receive (RX) buffer descriptors,
2
Note: Do not modify other bits of the I2MOD register when the EN bit is set or else
Note: The communication processor module sets all the status bits in this buffer
C
RES
1
2
C operation. When EN is cleared, the I
erratic operation will occur.
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
2
MPC823 REFERENCE MANUAL
4
L
C bus or when an overrun error occurs.
Go to: www.freescale.com
5
RX DATA BUFFER POINTER
6
DATA LENGTH
7
8
RESERVED
2
C controller is in a reset state and
9
10
2
C controller is enabled.
11
12
13
MOTOROLA
OV
14
RES
15