FUJITSU MB91460 SERIES FR60 - Manual (Page 18)

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Chapter 1 Introduction
1.How to Handle the Device
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Caution: during the PLL clock operation
Even if oscillator is disconnected or input is stopped while selecting PLL clock, self-excited oscillation circuit in the PLL
may continue running at self-running frequency. This self-running operation is not covered by guarantee.
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For more specification about operating voltage, see the latest data sheet.