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Rabbit 6000 User’s Manual
digi.com
201
If an internal clock is selected, the serial port data clocks can be generated from the appropriate 8-
bit timer (Timer A2 for Serial Port E and Timer A3 for Serial Port F) or from a dedicated 15-bit
divider. In HDLC mode, the bit data rate is equal to the data clock rate divided by 16.
When using an external clock, a 1× (same speed as the data rate) clock is supported. In this case,
the maximum data rate is 1/6 of the peripheral clock rate. The receive clock is generated from the
transitions in the data stream via a digital phase-locked loop (DPLL). The timing of this synchro-
nization is adjusted with each incoming transition, allowing for tracking if the two external clocks
differ slightly in frequency. For more on the clock synchronization and data encoding, see
Section 20.3.3.
20.1.1 Block Diagram
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Страница 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Страница 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...