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The crystal determines the clock speed of the microcontroller and thus how fast it executes it's instructions. Whether it affects the speed of the motor is determined by the program the controller uses to control the motor.
so...if in the program stated "half speed" its mean the motor can go to its half speed?..for ur info,im using 12V dc motor and it is really fast with high torque...
Carl, your post didn't appear before I typed. But I'm lagging like, what, 10 minutes? :embarrassed:
which program are you using? In the datasheet for your uC, look up for the compare and capture module.
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