
HDLC transmitter
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The SSP1 is used as a data source (could be interrupt or DMA driven).
The SCT generates a clock for the SSP1 (which is in slave mode), fetches the
serial data, and inserts zeros ("bit stuffing") where needed by the
HDLC protocol.

The bit clock is generated by Timer3. Although the SCT L counter is not used in this
application, it cannot be used as the bit clock source because of clock mode restrictions.


