20-101-1051 Rabbit Semiconductor, 20-101-1051 Datasheet - Page 46
![MODULE RABBITCORE RCM3365](/photos/6/74/67489/20-101-1051_sml.jpg)
20-101-1051
Manufacturer Part Number
20-101-1051
Description
MODULE RABBITCORE RCM3365
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-101-1051.pdf
(164 pages)
Specifications of 20-101-1051
Module/board Type
MPU Core Module
Product
Microcontroller Modules
Core Processor
Rabbit 3000
Flash
512 KBytes
Operating Supply Voltage
3.15 to 3.45 V
Board Size
69 mm x 47 mm x 22 mm
For Use With/related Products
RCM3365
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
316-1111
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4.5 Other Hardware
4.5.1 Clock Doubler
The RCM3365/RCM33610 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 RCM3365/RCM3375 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.
4.5.2 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.
40
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.
ENABLE_SPREADER=1
ENABLE_SPREADER=2
ENABLE_SPREADER=0
NOTE: Refer to the Rabbit 3000 Microprocessor User’s Manual for more information
NOTE: The strong spectrum-spreading setting is not recommended since it may limit
OK
OK
on the spectrum-spreading setting and the maximum clock speed.
the maximum clock speed or the maximum baud rate. It is unlikely that the strong set-
ting will be used in a real application.
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
RabbitCore RCM3365/RCM3375
menu.
menu.
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