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| 型號(hào)： | MPC823 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Communication Processor Module |
| 中文描述： | 通信處理器模塊 |
| 文件頁(yè)數(shù)： | 12/74頁(yè) |
| 文件大?。?/td> | 234K |
| 代理商： | MPC823 |
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Communication Processor Module
16-390
MPC823 REFERENCE MANUAL
MOTOROLA
S
C
1
P
A serial management controller in UART mode has one feature that an SCCx in UART mode
does not. Data length on an SMCx can be a maximum of 14 bits, whereas, a serial
communication controller only allows 8 bits. A serial management controller in UART mode
is also referred to as a SMCx UART controller.
16.11.6.1 FEATURES.
UART mode:
The following list summarizes the main features of the SMCx in
Flexible message-oriented data structure
Programmable data length (5–14 bits)
Programmable 1 or 2 stop bits
Even/odd/no parity generation and checking
Frame error, break, and idle detection
Transmit preamble and break sequences
Received break character length indication
Continuous receive and transmit modes
16.11.6.2 SMCx UART CHANNEL TRANSMISSION PROCESS.
designed to work with almost no intervention from the core. When the core enables the
SMCx transmitter, it starts transmitting idles. The SMCx UART controller immediately polls
the first buffer descriptor in the transmit channel buffer descriptor ring and once every
character time after that, depending on the character length. When there is a message to
transmit, the SMCx UART controller fetches the data from memory and starts transmitting
the message.
The UART transmitter is
Figure 16-115. SMCx UART Frame Format
SMTXD
SMCLK
16
×
START
BIT
5 TO 14 DATA BITS WITH THE
LEAST-SIGNIFICANT BIT FIRST
PAR.
BIT
OPTIONAL
1 OR 2
STOP BITS
(CLOCK NOT TO SCALE)
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