Communication Processor Module
16-406 MPC823e REFERENCE MANUAL MOTOROLA
SMC
COMMUNICATION
16
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.
Figure 16-119. SMCx UART Interrupt Example
LINE IDLE
10 CHARACTERS
CHARACTERS
RECEIVED BY SMC UART
TIME
RXD LINE IDLE
LINE IDLE
7 CHARACTERS
LINE IDLETXD
RX
RX
TX
BREAK
BRK
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.
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.
SMC UART SMCE
EVENTS
CHARACTERS
TRANSMITTED BY SMC UART
SMC UART SMCE
EVENTS
BRKE
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