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Old Jun 27, 2012, 05:46 PM
Dave8888 is offline
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Question

What does an external crystal do?


The new Hobbyking i86L board now has an external crystal (says 16.000 on top of it), what does it do?
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Old Jun 27, 2012, 05:51 PM
chaosdestro0 is offline
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Sets clock speed for processor?
Old Jun 28, 2012, 11:16 AM
kad is offline
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Quote:
Originally Posted by Dave8888 View Post
The new Hobbyking i86L board now has an external crystal (says 16.000 on top of it), what does it do?
I believe it sets the clock speed for the processor more precisely than the built in on the AVR chip.

-K
Old Jun 28, 2012, 11:44 AM
rkovvur is offline
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Yup, 16.000 means 16Mhz crystal. It is far more accurate than the AVR's internal oscillator which can drift with temperature and more accurate than a resonator.

I am little surprised as to why the 'lite' version has a crystal !

One more thing to know.

The internal oscillator of the ATmega328 (or the megas) can only go up to 8mhz guaranteed. anything beyond that is not. You can however push that internal frequency by a register setting(but it would not be guaranteed).


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