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Rabbit 6000 User’s Manual
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406
Table 36-2 lists the options for the clock modes and the processor clock frequency.
Depending on the application, the processor can continue executing code normally when the main
oscillator is divided down to a lower value. However, when the processor clock is running off the
32 kHz clock, the code and data contents of the 1MB RAM will not be preserved. The lowest fre-
quency for the processor clock that will preserve the contents of the 1MB RAM is 12MHz. It is
recommended that in that situation the Rabbit 6000 be performing a tight polling loop in another
memory device, either SRAM or external parallel flash, waiting for a wake-up event.
Table 36-2. Clock Modes
Main Oscillator
GCSR Setting
Clock
Doubler
32 kHz
Divider
Processor Clock
Frequency
Full
On
N/A
2 × Input frequency
(main oscillator or
PLL)
Full
Off
Input frequency
Divided by 2
On
Divided by 2
Off
Input frequency / 2
Divided by 4
On
Divided by 6
On
Input frequency / 3
Divided by 4
Off
Input frequency / 4
Divided by 8
On
Divided by 6
Off
Input frequency / 6
Divided by 8
Off
Input frequency / 8
Off
(32 kHz divider
used)
N/A
Disabled
32.768 kHz
/ 2
16.384 kHz
/ 4
8.192 kHz
/ 8
4.096 kHz
/ 16
2.048 kHz
Summary of Contents for 6000
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