EFM32WG Datasheet, PDF (126/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

Figure 11.1. CMU Overview
...the world's most energy friendly microcontrollers
AUXHFRCO
HFXO
HFRCO
LFXO
LFRCO
Tim eout ^AUXCLK
LESENSE
(High frequency tim ing)
MSC
(Flash Program m ing)
Tim eout
Tim eout
Tim eout
Tim eout
CMU_CTRL_DBGCLK
clock
sw it ch
Debug Trace
CMU_HFPERCLKEN0 .TIMER0
Clock
Gat e
HFPERCLKTIMER0
CMU_HFPERCLKEN0 .TIMER1
CMU_HFPERCLKDIV.HFPERCLKEN
prescaler ^HFPERCLK
CMU_HFPERCLKDIV.HFPERCLKDIV
CMU_CTRL.HFCLKDIV
clock
sw it ch
HFCLK
DIV
HFCLK
CMU_CMD.HFCLKSEL
CMU_HFCORECLKDIV
HFCORECLK
prescaler
CMU_CMD.USBCCLKSEL
CMU_HFCORECLKEN0 . USBC
clock
sw it ch
HFCORECLKUSBC
CMU_HFPERCLKEN0 .I2 C0
EM0
CMU_HFCORECLKEN0 . D MA
CMU_HFCORECLKEN0 .LE
Clock
Gat e
.
.
.
Clock
Gat e
Clock
Gat e
Clock
Gat e
.
.
.
Clock
Gat e
HFPERCLKTIMER1
.
.
.
HFPERCLKI2C0
HFCORECLKCM4
HFCORECLKDMA
.
.
.
HFCORECLKLE
/2 or /4
clock LFACLK
sw it ch
CMU_LFCLKSEL.LFA / LFAE
prescaler
CMU_LFAPRESC0 .LESENSE
prescaler
CMU_LFACLKEN0 .LESENSE
CMU_LFACLKEN0 .RTC
CMU_LFAPRESC0 .RTC
prescaler
CMU_LFACLKEN0 .LETIMER0
CMU_LFAPRESC0 .LETIMER0
CMU_LFACLKEN0 .LCD
prescaler ^LFACLKLCDpre Fram e Rat e Cont rol
CMU_LFAPRESC0 .LCD
CMU_LCDCTRL.FDIV
Clock
Gat e
LFACLKLESENSE
Clock
Gat e
LFACLKRTC
Clock
Gat e
LFACLKLETIMER0
Clock
Gat e
LFACLKLCD
PCNTn _S0
PCNTn CLK
CMU_PCNTCTRL. PCNTn CLKSEL
CMU_LFCLKSEL.LFB / LFBE
clock LFBCLK
sw it ch
CMU_LFBPRESC0 .LEUART0
prescaler
prescaler
CMU_LFBPRESC0 .LEUART1
CMU_LFBCLKEN0 .LEUART0
CMU_LFBCLKEN0 .LEUART1
Clock
Gat e
LFBCLKLEUART0
Clock
Gat e
LFBCLKLEUART1
ULFRCO
WDOGCLK
WDOG_CTRL.CLKSEL
WDOG
BURTC
11.3.1 System Clocks
11.3.1.1 HFCLK - High Frequency Clock
HFCLK is the selected High Frequency Clock. This clock is used by the CMU and drives the two
prescalers that generate HFCORECLK and HFPERCLK. The HFCLK can be driven by a high-frequency
oscillator (HFRCO or HFXO) or one of the low-frequency oscillators (LFRCO or LFXO). By default the
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