HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jun 27, 2012, 04:46 PM
Registered User
United States, AZ, Seligman
Joined Nov 2011
413 Posts
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?
Dave8888 is offline Find More Posts by Dave8888
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 27, 2012, 04:51 PM
Quad lover.
chaosdestro0's Avatar
Joined Dec 2011
853 Posts
Sets clock speed for processor?
chaosdestro0 is offline Find More Posts by chaosdestro0
Reply With Quote
Old Jun 28, 2012, 10:16 AM
kad
Quad Crasher
kad's Avatar
United States, NY, Poughkeepsie
Joined May 2012
663 Posts
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
kad is offline Find More Posts by kad
Reply With Quote
Old Jun 28, 2012, 10:44 AM
R/C newbie
United States, TX, Austin
Joined Mar 2008
181 Posts
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).
rkovvur is offline Find More Posts by rkovvur
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion What Can I do with an MQX board? jake42 Multirotor Talk 3 Jun 26, 2012 11:44 PM
Discussion What does the roll/pitch/yaw do for the Mag sensor on Multiwii? signal15 Multirotor Talk 0 Jun 24, 2012 12:55 AM
Discussion How ''Bad'' is is not to run an external bec? SARCFAN Racing Boats - Electric 8 Jun 19, 2012 01:18 AM
Discussion What Does an ESC Do and How Does It Do It? -Link Please Murocflyer Power Systems 12 Jun 19, 2009 01:15 PM
Discussion What exactly does an external BEC do ? skareb1986 Mini Helis 14 Sep 26, 2006 07:56 PM