BL4S200 User’s Manual
48
3.8.2 Spectrum Spreader
The Rabbit microprocessors features a spectrum spreader, which help to mitigate EMI
problems. By default, the spectrum spreader is on automatically, 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.
NOTE:
Refer to the
Rabbit 4000 Microprocessor User’s Manual
and the
Rabbit 5000
Microprocessor User’s Manual
for more information on the spectrum-spreading set-
tings and the maximum clock speed.
1.
Select the “Defines” tab from the Dynamic C
Options > Project Options
menu.
2. Normal spreading is the default, and usually no entry is needed. If you need to specify nor-
mal spreading, add the line
ENABLE_SPREADER=1
For strong spreading, add the line
ENABLE_SPREADER=2
To disable the spectrum spreader, add the line
ENABLE_SPREADER=0
NOTE:
The strong spectrum-spreading setting is not recommended since it may limit
the maximum clock speed or the maximum baud rate. It is unlikely that the strong set-
ting will be used in a real application.
3.
Click
OK
to save the macro.
The spectrum spreader will be set according to the macro
value whenever a program is compiled using this project file
.
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