mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 658

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

Communication Processor Module
16.9.15.8 SCCx UART CONTROL CHARACTERS. The SCCx UART controller can
recognize special control characters that can be used in a message-oriented environment.
You can define a maximum of eight control characters in the control characters table. Each
character can either be written to the receive buffer or rejected. If it is rejected, the character
is written to the received control character register in internal RAM and a maskable interrupt
is generated. With this method, you know when the control characters (XON or XOFF) that
are not part of the received messages have arrived. The SCCx UART controller uses a table
of 16-bit entries to support control character recognition and each entry consists of the
control character, a valid bit, and a reject character bit.
SCCX BASE + 50
SCCX BASE + 52
SCCX BASE + 54
SCCX BASE+ 5E
SCCX BASE + 62
SCCX BASE+ 60
MASTER
T
T
1
R
R
Figure 16-73. Two UART Multidrop Mode Configuration Examples
UADDR1
UADDR2
SLAVE 1
T
T
—
E
E
E
E
0
1
2
R
R
—
Freescale Semiconductor, Inc.
R
R
R
R
1
1
TWO 8-BIT ADDRESSES
CAN BE AUTOMATICALLY
RECOGNIZED IN EITHER
CONFIGURATION.
For More Information On This Product,
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2
SLAVE 2
T
T
MPC823 REFERENCE MANUAL
3
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R
R
3
Go to: www.freescale.com
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4
SLAVE 3
T
T
—
—
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5
4
R
R
—
—
—
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—
6
PAODR
—
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7
•
•
•
R
8
R
+V
+V
9
10
CHOOSE WIRED-OR
OPERATION IN THE PORT A
OPEN-DRAIN REGISTER TO
ALLOW MULTIPLE TRANSMIT
PINS TO BE DIRECTLY
CONNECTED.
CHARACTER1
CHARACTER2
CHARACTER3
CHARACTER8
11
RCCRP
RCCM
12
13
MOTOROLA
14
15