mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 866

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

Communication Processor Module
CLEN—Character Length
This field is programmed with a value between 3 and 15 to obtain 4 to 16 bits per character.
If the character length is less than 8 bits, the MSBs of the byte in buffer memory are not used
on transmit and are written with zeros on receive. On the other hand, if the character length
is more than 8 bits but less than 16 bits, the MSBs of the half-word in buffer memory are not
used on transmit and are written with zeros on receive.
BS—Byte Sequence
This bit controls the sequence of byte transmission if the REVD bit is set for a character
length greater than 8 bits. It must be set to zero to maintain behavior compatibility with the
MC68360 QUICC microprocessor.
REVD—Reverse Data
SM—SMCx Mode
DM—Diagnostic Mode
TEN—SMCx Transmit Enable
0 = Normal mode. This must be selected if the character length is less than
1 = Transmit lower address byte first.
0 = Normal mode.
1 = Reverse the character bit order. The MSB is transmitted first.
00 = GCI or SCIT mode.
01 = Reserved.
10 = UART mode.
11 = Totally transparent mode. This must be selected for SMCx transparent operation.
00 = Normal mode.
01 = Local loopback mode.
10 = Echo mode.
11 = Reserved.
0 = SMCx transmitter disabled.
1 = SMCx transmitter enabled.
or equal to 8 bits.
Note: Erratic behavior will occur if you do not write the values 0 to 2 to CLEN. Larger
Note: Once the TEN bit is cleared, it must not be reenabled for at least
character lengths increase the potential performance of the SMCx channel and
lower the performance impact of other channels. For instance, using 16-bit
characters, rather than 8-bit characters is recommended if 16-bit characters are
acceptable in the final application.
three serial clocks.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
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