20-101-1196 Rabbit Semiconductor, 20-101-1196 Datasheet - Page 42
![MODULE RABBITCORE RCM3900](/photos/6/74/67481/20-101-1196_sml.jpg)
20-101-1196
Manufacturer Part Number
20-101-1196
Description
MODULE RABBITCORE RCM3900
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-101-1196.pdf
(168 pages)
Specifications of 20-101-1196
Module/board Type
MPU Core Module
For Use With/related Products
RCM3900
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
20-101-1196
316-1155
316-1155
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- Download datasheet (3Mb)
4.5 Other Hardware
4.5.1 Clock Doubler
The RCM3900 takes advantage of the Rabbit 3000 microprocessor’s internal clock dou-
bler. A built-in clock doubler allows half-frequency crystals to be used to reduce radiated
emissions. The 44.2 MHz frequency specified for the RCM3900 is generated using a
22.12 MHz crystal.
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.
RabbitCore RCM3900 User’s Manual
1. Select the “Defines” tab from the Dynamic C
2. Add the line
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
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
CLOCK_DOUBLED=0
to always disable the clock doubler.
Options > Project Options
Options > Project Options
CLOCK_DOUBLED=1
menu.
menu.
to
42
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