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The Speech LSI Utility sets the clock frequency to be used and generates sound data.
For example, when using a 4.000MHz clock, set 4.000MHz in the Speech LSI Utility.
Please refer to "3.2.9. Selecting the Source Oscillation Frequency (Fosc)" in the Speech LSI Utility User's Manual.
If you use sound data that is different from the set frequency, it will not be played back at the correct frequency.