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An external clock source (CMOS or crystal/resonator) is known as the XTI source. The XTI source can be either a CMOS logic source, or a crystal resonator .
When the PLL is locked, the secondary clock source automatically selects the PLL clock (256fS). Otherwise, the XTI clock source is selected. Register 32h should be used for dividing in the lock status (that is, the PLL source). When unlocked, Register 33h should be used (the XTI source).
