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Rabbit 6000 User’s Manual
digi.com
24
2.3.4 Clock Doubler
The clock doubler allows a lower frequency crystal to be used for the main oscillator and to provide an
added range over which the clock frequency can be adjusted. The clock doubler is controlled via the
Global Clock Double Register (GCDR).
The clock doubler uses an on-chip delay circuit that must be programmed by the user at startup if there is a
need to double the clock. Table 2-5 lists the recommended delays in GCDR for various oscillator or crystal
frequencies.
Table 2-5. Recommended Delays Set In GCDR for Clock Doubler
Recommended GCDR Value
Frequency Range
0x0F
7.3728 MHz
0x0B
7.3728–11.0592 MHz
0x09
11.0592–16.5888 MHz
0x06
16.5888–20.2752 MHz
0x03
20.2752–52.8384 MHz
0x01
52.8384–77.4144 MHz
0x00
>77.4144 MHz
Содержание 6000
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