Silicon Laboratories EFR32xG21 Wireless Gecko Reference Manual page 137
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Also See for EFR32xG21 Wireless Gecko:
- Manual (32 pages) ,
- User manual (33 pages) ,
- Worksheet (18 pages)
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FSRCO
(FSRCO)
HFXO
HFRCODPLL
HFRCO
DPLL
CLKIN0
HFRCO
EM23
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/EM4
· Available in EM0/EM1/EM2/EM3/EM4
LFXO
LFRCO
ULFRCO
silabs.com | Building a more connected world.
HFXO
branch
gate
CMU_RADIOCLKCTRL.
EN
(hidden)
prescaler
/1, /2
CMU_SYSCLKCTRL.
LSPCLKPRESC
prescaler
/1, /2
CMU_SYSCLKCTRL.
PCLKPRESC
HFXO
clock
switch
CLKIN0
SYSCLK
prescaler
/1, /2, /4
CMU_SYSCLKCTRL.
HCLKPRESC
CMU_SYSCLKCTRL.
CLKSEL
HFRCOEM23
HFRCODPLL
HFRCOEM23
ULFRCO
ULFRCO
HCLK
prescaler
/1024
ULFRCO
Figure 8.1. CMU Overview
HCLKRADIO
LSPCLK
PCLK
HCLK
EXPCLK
prescaler
CMU_EXPORTCLKCTRL.PRESC
FSRCO
IADCCLK
clock
switch
CMU_IADCCLKCTRL.CLKSEL
HFXO
clock
EM01GRPACLK
switch
FSRCO
CMU_EM01GRPACLKCTRL.CLKSEL
LFXO
LFRCO
EM23GRPACLK
clock
switch
CMU_EM23GRPACLKCTRL.CLKSEL
LFXO
LFRCO
clock
WDOGnCLK
switch
CMU_WDOGnCLKCTRL.CLKSEL
LFXO
LFRCO
EM4GRPACLK
clock
switch
CMU_EM4GRPACLKCTRL.CLKSEL
Reference Manual
CMU - Clock Management Unit
Radio
I2C0
USARTn
I2C1
LDMA
GPCRC
MBIST
IADC
TIMERn
LETIMERn
SYSTICK
WDOGn
BURTC
Rev. 0.4 | 137
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