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LFXT1CLK: Low-frequency/high-frequency oscillator that can be used<br />either with low-frequency 32768-Hz watch crystals, or standard crystals<br />or resonators in the 450-kHz to 8-MHz range.<br /> XT2CLK: Optional high-frequency oscillator that can be used with<br />standard crystals, resonators, or external clock sources in the 450-kHz to<br />8-MHz range.<br /> DCOCLK: Internal digitally controlled oscillator (DCO) with RC-type<br />characteristics.<br />Three clock signals are available from the basic clock module:<br /> ACLK: Auxiliary clock. The ACLK is the buffered LFXT1CLK clock source<br />divided by 1, 2, 4, or 8. ACLK is software selectable for individual<br />peripheral modules.<br /> MCLK: Master clock. MCLK is software selectable as LFXT1CLK,<br />XT2CLK (if available), or DCOCLK. MCLK is divided by 1, 2, 4, or 8. MCLK<br />is used by the CPU and system.<br /> SMCLK: Sub-main clock. SMCLK is software selectable as LFXT1CLK,<br />XT2CLK (if available on-chip), or DCOCLK. SMCLK is divided by 1, 2, 4,<br />or 8. SMCLK is software selectable for individual peripheral modules.
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