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Switching between crystal oscillator/ceramic oscillator and built-in RC oscillator is set in the Speech LSI Utility used when creating voice code data. Please see "4.2.1.2.10. User setting Parameter Dialog (ML22(Q)53x/62x/66x)" in the Speech LSI Utility User's Manual. Please select “Source clock oscillation” here. Please select “X'tal” when using an external clock.