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