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4.4 Other Hardware
4.4.1 Clock Doubler
The RCM3360/RCM3370 takes advantage of the Rabbit 3000 microprocessor ’s internal
clock doubler. A built-in clock doubler allows half-frequency crystals to be used to reduce
radiated emissions. The 44.2 MHz frequency specified for the RCM3360/RCM3370 is
generated using a 22.12 MHz resonator.
The clock doubler may be disabled if 44.2 MHz clock speeds are not required. This will
reduce power consumption and further reduce radiated emissions. The clock doubler is
disabled with a simple change to the BIOS as described below.
1. Open the BIOS source code file, RABBITBIOS.C in the BIOS directory.
2. Change the line
#define CLOCK_DOUBLED 1 //
//
//
//
set to 1 to double clock if
Rabbit 2000: crystal <= 12.9024 MHz,
Rabbit 3000: crystal <= 26.7264 MHz,
or to 0 to always disable clock doubler
to read as follows.
#define CLOCK_DOUBLED 0
3. Save the change using File > Save .
4.4.2 Spectrum Spreader
The Rabbit 3000 features a spectrum spreader, which helps to mitigate EMI problems. The
spectrum spreader is on by default, but it may also be turned off or set to a stronger setting
by changing the following macro in the BIOS.
#define ENABLE_SPREADER 1
// Set to 0 to disable spectrum spreader,
// 1 to enable normal spreading, or
// 2 to enable strong spreading.
NOTE: The strong spectrum-spreading setting is not recommended since it may limit the
maximum clock speed or the maximum baud rate.
32
RabbitCore RCM3360/RCM3370
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