Motorola PowerQUICC II MPC8280 Series Reference Manual page 756

SCC UART Receive Buffer Descriptor (RxBD)
21.17 SCC UART Receive Buffer Descriptor (RxBD)
The CPM uses RxBDs to report on each buffer received. The CPM closes the current buffer,
generates a maskable interrupt, and starts receiving data into the next buffer after one of the
following occurs:
• A user-defined control character is received.
• An error occurs during message processing.
• A full receive buffer is detected.
• A MAX_IDL number of consecutive idle characters is received.
• An
ENTER HUNT MODE
• An address character is received in multidrop mode. The address character is written
to the next buffer for a software comparison.
Figure 21-7 shows an example of how RxBDs are used in receiving.
21-16
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or
CLOSE RXBD
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command is issued.
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