Effect of Crystal Capture Range Exceeded in Failsafe Clock
Created by alexarnaut on Dec 19, 2008 12:00 AM. Last modified by alexarnaut on Dec 28, 2011 1:41 AM.
Question: What happens when the reference frequency changes beyond the capture-range of the crystal oscillator?
When the reference frequency changes beyond the capture range (either higher or lower) of the crystal oscillator, the FAIL#/SAFE indicator pin will go high while the VCO will still be locked to the last setting of the crystal oscillator.