mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 842

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

Communication Processor Module
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. The following list summarizes the main features of the SMCx in
UART mode:
16.11.6.2 SMCx UART CHANNEL TRANSMISSION PROCESS. The UART transmitter is
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.
• 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
SMTXD
SMCLK
16
START
BIT
Figure 16-115. SMCx UART Frame Format
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
LEAST-SIGNIFICANT BIT FIRST
5 TO 14 DATA BITS WITH THE
Go to: www.freescale.com
OPTIONAL
PAR.
BIT
(CLOCK NOT TO SCALE)
1 OR 2
STOP BITS
MOTOROLA