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These bits configure the high speed peripheral clock rate with reference to SYSCLKOUT and the clock output of this prescaler is used in generating the SOCs and the external ADC clock (EXTADCCLK), used for external ADC interface. At reset, the EXTADCCLK will be generated and sent out so that external ADCs that need a clock at reset can work properly. HSPCLK = SYSCLKOUT / [(HISPCP +1)* 2]
