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Save a quartz and share clock between 2 PICs

 
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gip_mad



Joined: 23 Aug 2008
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Save a quartz and share clock between 2 PICs
PostPosted: Sun Feb 05, 2012 12:44 pm     Reply with quote
Hi, I'm using 2 PICs on the same board, and I want to save a quartz; Does anyone know how to share the clock source? My idea is to connect the oscillator as usual to one of the PICs and configure it to oscillate correctly, and then connect the CLKO of this PIC to the CLKI of the other one, configuring it to use external clock. Will it work?
Thanks!
asmallri



Joined: 12 Aug 2004
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Re: Save a quartz and share clock between 2 PICs
PostPosted: Sun Feb 05, 2012 12:56 pm     Reply with quote
gip_mad wrote:
Hi, I'm using 2 PICs on the same board, and I want to save a quartz; Does anyone know how to share the clock source? My idea is to connect the oscillator as usual to one of the PICs and configure it to oscillate correctly, and then connect the CLKO of this PIC to the CLKI of the other one, configuring it to use external clock. Will it work?
Thanks!


Yes however you have to take into account the additional capacitive loading of the second PIC's CLKI input and adjust the crystal load capacitor accordingly.
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gip_mad



Joined: 23 Aug 2008
Posts: 24
Location: Italy

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PostPosted: Sun Feb 05, 2012 12:58 pm     Reply with quote
I LOVE this forum.

Thank you!
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