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Rabbit 6000 User’s Manual
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26
The maximum allowed clock speed must be reduced slightly if the clock is supplied via the clock doubler.
The only signals clocked on the falling edge of the clock are the memory and I/O write pulses, and the
early option memory output enable. See Chapter 5 for more information on the early output enable and
write enable options.
The power consumption is proportional to the clock frequency, and for this reason power can be reduced
by slowing the clock when less computing activity is taking place. The clock doubler provides a conve-
nient method of temporarily speeding up or slowing down the clock as part of a power management
scheme.
2.3.5 32 kHz Clock
The 32.768 kHz clock is used to drive the asynchronous serial bootstrap, the real-time clock, the periodic
interrupt, and the watchdog timers; see Section 4.3 for detailed descriptions of these features. If these fea-
tures are not used in a design, the use of the 32 kHz clock is optional.
A self-contained external oscillator is the recommended oscillator circuit for the Rabbit 6000, but a tunable
oscillator circuit such as the one shown below may be used. The values of resistors and capacitors may
need to be adjusted for various frequencies and crystal load capacitances. Rabbit’s Technical Note TN235,
External 32.768 kHz Oscillator Circuits
, is available on the Rabbit Web site and goes into this circuit
in detail.
Figure 2.4 Basic 32.768 kHz Oscillator Circuit
Содержание 6000
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