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11.3.1.5 LFBCLK - Low Frequency B Clock
LFBCLK is the selected clock for the Low Energy B Peripherals. There are three selectable sources
for LFBCLK: LFRCO, LFXO and HFCORECLK LE /2. In addition, the LFBCLK can be disabled. From
reset, the LFBCLK source is set to LFRCO. However, note that the LFRCO is disabled from reset. The
selection is configured using the LFB field in CMU_LFCLKSEL. The HFCORECLK LE /2 setting allows
the Low Energy B Peripherals to be used as high-frequency peripherals.
Note
If HFCORECLK/2 is selected as LFBCLK, the clock will stop in EM2/3.
Each Low Energy Peripheral that is clocked by LFBCLK has its own prescaler setting and enable bit.
The prescaler settings are configured using CMU_LFBPRESC0 and the clock enable bits can be found
in CMU_LFBCLKEN0.
11.3.1.6 PCNTnCLK - Pulse Counter n Clock
Each available pulse counter is driven by its own clock, PCNTnCLK where n is the pulse counter instance
number. Each pulse counter can be configured to use an external pin (PCNTn_S0) or LFACLK as
PCNTnCLK.
11.3.1.7 WDOGCLK - Watchdog Timer Clock
The Watchdog Timer (WDOG) can be configured to use one of three different clock sources: LFRCO,
LFXO or ULFRCO. ULFRCO (Ultra Low Frequency RC Oscillator) is a separate 1 kHz RC oscillator
that also runs in EM3.
11.3.1.8 AUXCLK - Auxiliary Clock
AUXCLK is a 14 MHz clock driven by a separate RC oscillator, AUXHFRCO. This clock is used for flash
programming and Serial Wire Output (SWO). During flash programming, this clock will be active. If the
AUXHFRCO has not been enabled explicitly by software, the MSC module will automatically start and
stop it. The AUXHFRCO is enabled by writing a 1 to AUXHFRCOEN in CMU_OSCENCMD. This explicit
enabling is required when SWO is used.
11.3.2 Oscillator Selection
11.3.2.1 Start-up Time
The different oscillators have different start-up times. For the RC oscillators, the start-up time is fixed,
but both the LFXO and the HFXO have configurable start-up time. The start-up time is configured by
software and can be optimized for the chosen crystal used in the application.
There are individual bits for each oscillator indicating the status of the oscillator:
? ENABLED - Indicates that the oscillator is enabled
? READY - Start-up time is exceeded
? SELECTED - Start-up time is exceeded and oscillator is chosen as clock source
These status bits are located in the CMU_STATUS register.
11.3.2.2 Switching Clock Source
The HFRCO oscillator is a low energy oscillator with extremely short wake-up time. Therefore, this
oscillator is always chosen by hardware as the clock source for HFCLK when the device starts up (e.g.
after reset and after waking up from EM2 and EM3). After reset, the HFRCO frequency is 14 MHz.
2011-04-12 - d0001_Rev1.10
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