Motorola MPC823e - Page 769

Communication Processor Module
MOTOROLA MPC823e REFERENCE MANUAL 16-315
COMMUNICATION
16
PROCESSOR MODULE
SCCs
GLT—Glitch on TX
If set, this bit indicates that a serial communication controller has found a glitch on the
transmit clock.
DCC—DPLL CS Changed
This bit indicates when the carrier sense status, which is generated by the DPLL, changes
state. The real-time status can be found in the SCCS–Transparent register. This is not the
CDx
pin status that is mentioned elsewhere and it is only valid when the DPLL is used.
GRA—Graceful Stop Complete
This bit indicates when a graceful stop initiated by the GRACEFUL STOP TRANSMIT
command has completed. This bit is set as soon as the transmitter finishes any frame that
was in progress when the command was issued. It is set immediately if no frame was in
progress.
TXE—TX Error
This bit indicates that an error has occurred on the transmitter channel. The I bit in the
transmit buffer descriptor must be set in order to get an update of this bit.
RCH—Receive Character
This bit indicates that a byte or word has been received and written to the buffer, depending
on the RFW bit in the GSMR_H.
BSY—Busy Condition
This bit indicates that a byte or word has been received and discarded due to a lack of
buffers. The receiver resumes reception after it gets an ENTER HUNT MODE command.
TX—TX Buffer
This bit indicates that a buffer has been transmitted. This bit is set no sooner than when the
last bit of the last byte of the buffer begins its transmission, assuming the L bit of the TX
buffer descriptor is set. If it is not set, TX is set when the last byte of data is written to the
transmit FIFO. The I bit in the TX buffer descriptor must be set in order to get an update of
this bit.
RX—RX Buffer
This bit indicates that a complete buffer has been received on the SCCx channel. This bit is
set no sooner than two serial clocks after the last bit of the last byte in which the buffer is
received on the RXDx pin. The I bit in the receive buffer descriptor must be set in order to
get an update of this bit.