Functional Description - Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual

11.3 Functional Description

An overview of the high frequency portion of the CMU is shown in
An overview of the low frequency portion is shown in
show the CMU for the largest device in the EFR32 family. Refer to the Configuration Summary in the device data sheet to see which
core, radio, and peripheral modules, and therefore clock connections, are present in a specific device.
AUXCLK
AUX
HFRCO
Availability of oscillators and clocks in Energy Modes:
· Available in EM0/EM1
· Available in EM0/EM1/EM2
· Available in EM0/EM1/EM2/EM3
· Available in EM0/EM1/EM2/EM3/EM4H
· Available in EM0/EM1/EM2/EM4H/EM4S
· Available in EM0/EM1/EM2/EM3/EM4H/EM4S
HFXO
HFRCO
CLKIN0
LFXO
LFRCO
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Figure 11.2 CMU Overview - Low Frequency Portion on page
HFSRCCLK
HFXO
AUXCLK
CMU_ADCCTRL.ADCnCLKSEL
HFRCO
HFXO
Timeout
CMU_CTRL.CLKOUTSELn
HFRCODIV2
50% duty
/2
HFXO
HFRCO
clock
CLKIN0
switch
LFXO
LFRCO
CMU_HFCLKSEL.HF
Timeout
Timeout
Figure 11.1. CMU Overview - High Frequency Portion
Figure 11.1 CMU Overview - High Frequency Portion on page
HFPERCLK
xor
CMU_ADCCTRL.ADCnCLKINV
AUXCLK
clock
switch
HFCLK
CMU_DBGCLKSEL.DBG
CMU_CTRL.HFRADIOCLKEN
prescaler
CMU_HFRADIOPRESC.PRESC
CMU_CTRL.HFPERCLKEN
prescaler
CMU_HFPERPRESC.PRESC
CLKOUTn
prescaler
CMU_HFCOREPRESC.PRESC
50% duty
prescaler
HFSRCCLK
HFCLK
prescaler
CMU_HFEXPPRESC.PRESC
CMU_HFPRESC.PRESC
Reference Manual
CMU - Clock Management Unit
281. These figures
AUXCLK
LESENSE
(High frequency timing)
ADCn
ADC_CLK
ADC
ADCCLKMODE
DBGCLK
Debug Trace
HFXO
Radio Transceiver
CMU_HFRADIOCLKEN0.MODEM
HFRADIOCLK HFRADIOCLK
Clock
Gate
CMU_HFRADIOCLKEN0.SYNTH
HFRADIOCLK
Clock
Gate
CMU_HFPERCLKEN0.TIMERn
HFPERCLK HFPERCLK
Clock
Gate
CMU_HFPERCLKEN0.USARTn
HFPERCLK
Clock
Gate
EM0
HFCORECLK HFCORECLK
Clock
Gate
HFEXPCLK
CMU_HFBUSCLKEN0.GPIO
HFBUSCLK
Clock
Gate
CMU_HFBUSCLKEN0.LDMA
HFBUSCLK
Clock
Gate
HFBUSCLK
HFBUSCLK
CMU_HFBUSCLKEN0.LE
HFBUSCLK
Clock
Gate
280.
MODEM
SYNTH
TIMERn
USARTn
CORTEX
GPIO
LDMA
BUSMATRIX
DMEM
LE
Rev. 1.1 | 280