mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 899

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

W—Wrap (Final Buffer Descriptor in Table)
I—Interrupt
L—Last
CM—Continuous Mode
This bit is only valid when the serial peripheral interface is in master mode. In slave mode,
it must be written as a zero.
UN—Underrun
This bit indicates that the serial peripheral interface has encountered a transmitter underrun
condition while transmitting a data buffer. This error condition is only valid when the serial
peripheral interface is in slave mode. The serial peripheral interface writes this bit after it
finishes transmitting the associated data buffer.
ME—Multimaster Error
This bit indicates that this buffer is closed because the SPISEL pin was asserted when the
serial peripheral interface was in master mode. This indicates a synchronization problem
between multiple masters on the SPI bus. The serial peripheral interface writes this bit after
it finishes transmitting the associated data buffer.
0 = This is not the last buffer descriptor in the TX buffer descriptor table.
1 = This is the last buffer descriptor in the TX buffer descriptor table. After this buffer is
0 = No interrupt is generated after this buffer is serviced.
1 = The TXB or TXE bit in the SPI event register is set when this buffer is serviced. TXB
0 = This buffer does not contain the last character of the message.
1 = This buffer contains the last character of the message.
0 = Normal operation.
1 = The R bit is not cleared by the communication processor module after this buffer
used, the communication processor module receives incoming data into the first
buffer descriptor that TBASE points to in the table. The number of TX buffer
descriptors in this table is programmable and determined only by the W bit and
overall space constraints of the dual-port RAM.
and TXE can cause interrupts if they are enabled.
descriptor is closed, thus allowing the associated data buffer to be automatically
retransmitted next time the communication processor module accesses this buffer
descriptor.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
Communication Processor Module
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