Texas Instruments SimpleLink CC2620 Technical Reference Manual page 419

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6.1.4.1.1 Controlling the Oscillators
Figure 6-3 shows that the oscillator interface is located in AUX_PD.
For the system CPU to access the oscillator interface, perform the following steps:
• Power on AUX_PD by setting AON_WUC:AUXCTL.AUX_FORCE_ON = 1
• Ensure AUX_PD is powered up by checking the bit AON_WUC:PWRSTAT.AUX_PD_ON
• Turn on the oscillator interface clock in AUX_WUC:MODCLKEN0: AUX_DDI0_OSC = 1
Clock
SCLK_LF
SCLK_HF
SCLK_LF_AUX
ACLK_ADC
ACLK_REF
ACLK_TDC
SWCU117C – February 2015 – Revised September 2015
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Table 6-4. System Clocks
Description
Low-frequency clock
Always used for AON
Available for MCU_VD and AUX_PD in
Standby
High-frequency clock
Used by MCU_VD in active and idle
modes
Used by AUX_PD in active mode
Used for low-power comparator in
AUX_PD (COMP_B)
Used as clock source for ADC
Used as a start or stop source for Time-
to-Digital Converter (TDC)
Used as clock for TDC
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Possible Sources
31.25 kHz derived from 24-MHz XTAL oscillator
32-kHz RC oscillator
32.768-kHz XTAL oscillator
31.25 kHz derived from 48-MHz RC oscillator
Selectable in DDI_0_OSC:CTL0.SCLK_LF_SRC_SEL
48 MHz derived from 48-MHz RC oscillator
48 MHz derived from 24-MHz XTAL oscillator (doubled
internally)
Selectable in DDI_0_OSC:CTL0.SCLK_HF_SRC_SEL
Same as SCLK_LF
Same as SCLK_HF
Same sources as for SCLK_LF
Selectable in DDI_0_OSC:CTL0.SCLK_LF_SRC_SEL
48 MHz from RC oscillator
24 MHz from RC oscillator
24 MHz from XTAL oscillator
Selectable in DDI_0_OSC:CTL0.ACLK_TDC_SRC_SEL
Power, Reset, and Clock Management
Introduction
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