The clock module provides the following oscillators:
- LFOSC: Internal low-frequency oscillator (32kHz)
- SYSOSC: Internal high-frequency oscillator (32MHz with factory trim)
- LFXT/LFCKIN : low-frequency external crystal oscillator or digital clock input (32kHz)
- HFXT/HFCKIN: high-frequency external crystal oscillator or digital clock input (4MHz to 32MHz)
The following clocks are distributed by the clock module for use by the processor, bus, and peripherals:
- MCLK: Main system clock for PD1 peripherals, derived from SYSOSC, LFCLK, or HSCLK, active in RUN and SLEEP modes
- CPUCLK: Clock for the processor (derived from MCLK), active in RUN mode
- ULPCLK: Ultra-low power clock for PD0 peripherals, active in RUN, SLEEP, STOP, and STANDBY modes
- MFCLK: 4MHz fixed mid-frequency clock for peripherals, available in RUN, SLEEP, and STOP modes
- LFCLK: 32kHz fixed low-frequency clock for peripherals or MCLK, active in RUN, SLEEP, STOP, and STANDBY modes
- ADCCLK: ADC clock, available in RUN, SLEEP and STOP modes
- RTCCLK: fixed 32kHz clock direct to
RTC
- CLK_OUT: Used to output a clock externally, available in RUN, SLEEP, STOP, and STANDBY modes
- HFCLK: High frequency clock derived from HFXT or HFCLK_IN, available in RUN and SLEEP mode
- HSCLK: High speed clock derived from HFCLK, available in RUN and SLEEP mode
For more details, see the CKM chapter of the MSPM0 L-Series 32MHz
Microcontrollers Technical Reference
Manual.