20-101-1067 Rabbit Semiconductor, 20-101-1067 Datasheet - Page 41

• Manufacturer Part Number: 20-101-1067
• Description: MODULE RABBITCORE RCM3305
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1067

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Flash: 512 KBytes
• Timers: 10 bit
• Operating Supply Voltage: 3.15 to 3.45 V
• Board Size: 47 mm x 69 mm x 22 mm
• For Use With/related Products: RCM3305
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1113

4.4 Other Hardware
4.4.1 Clock Doubler
The RCM3305/RCM3315 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 RCM3305/RCM3315 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 configuration macro as shown below.
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.
The means for doing so is through a simple configuration macro as shown below.
User’s Manual
1. Select the “Defines” tab from the Dynamic C
2. Add the line CLOCK_DOUBLED=0 to always disable the clock doubler.
3. Click
1. Select the “Defines” tab from the Dynamic C
2. Normal spreading is the default, and usually no entry is needed. If you need to specify
3. Click
The clock doubler is enabled by default, and usually no entry is needed. If you need to
specify that the clock doubler is always enabled, add the line CLOCK_DOUBLED=1 to
always enable the clock doubler.
in the project file where you defined the macro.
normal spreading, add the line
For strong spreading, add the line
To disable the spectrum spreader, add the line
by the macro value whenever you are in the project file where you defined the macro.
NOTE: The strong spectrum-spreading setting is unnecessary for the RCM3305/RCM3315.
ENABLE_SPREADER=1
ENABLE_SPREADER=2
ENABLE_SPREADER=0
NOTE: Refer to the Rabbit 3000 Microprocessor User’s Manual for more information
OK
OK
on the spectrum-spreading setting and the maximum clock speed.
to save the macro. The spectrum spreader will now be set to the state specified
to save the macro. The clock doubler will now remain off whenever you are
Options > Project Options
Options > Project Options
menu.
menu.
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