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Main system and subsystem oscillation circuits generate the internal clock signals for the CPU and peripheral hardware. The main system clock can use a Crystal, Ceramic, or RC oscillation source, or an externally- generated clock signal. The subsystem clock requires either a crystal oscillator or an external clock source. Bit settings in the 4-bit power control and system clock mode registers select the oscillation source, the CPU clock, and the clock used during power-down mode. The internal system clock signal (fxx) can be divided inter- nally to produce four CPU clock frequencies - fx/4, fx/8, fx/64, or fxt/4.
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