Motorola MPC823e Reference Manual page 860

Communication Processor Module
RX—Receive Buffer
This bit indicates that a buffer has been received and its associated RX buffer descriptor is
now closed. It is set in the middle of the last stop bit of the last character that is written to the
receive buffer.
CHARACTERS
RECEIVED BY SMC UART
TIME
RXD LINE IDLE
SMC UART SMCE
EVENTS
NOTES:
1. The first RX event assumes receive buffers are six bytes each.
2. The second RX event position is programmable based on the max_IDL value.
3. The BRK event occurs after the first break character is received.
CHARACTERS
TRANSMITTED BY SMC UART
TXD LINE IDLE
SMC UART SMCE
EVENTS
NOTE: The TX event assumes all seven characters were put into a single buffer, and the TX event occurred when the seventh
character was written to the SMC transmit FIFO.
Figure 16-119. SMCx UART Interrupt Example
16-406
10 CHARACTERS
RX
7 CHARACTERS
TX
MPC823e REFERENCE MANUAL
LINE IDLE
BREAK
RX BRK BRKE
LINE IDLE
MOTOROLA