SWCU192 User guide

SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7

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11. 993
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  3. 996
997

8.5.1.1 Controlling the Oscillators

Table 8-4 lists the system clock descriptions and possible sources.

Table 8-4 System Clocks

Clock	Description	Possible sources
SCLK_LF	Low frequency clock Always used by AON Available for AUX in active and standby modes	31.25 kHz derived from 48 MHz RC oscillator 31.25 kHz derived from 48 MHz crystal oscillator 32 kHz RC oscillator 32.768 kHz crystal oscillator Selectable in [DDI_0_OSC:CTL0.SCLK_LF_SRC_SEL]
SCLK_MF	Medium frequency clock Always used by PMCTL in active and idle modes Available for AUX in active, idle, and standby modes	2 MHz RC oscillator
SCLK_HF	High frequency clock Used by MCU_VD in active and idle modes Available for AUX in active and idle mode	48 MHz derived from 48 MHz RC oscillator 48 MHz derived from 48 MHz crystal oscillator Selectable in [DDI_0_OSC:CTL0.SCLK_HF_SRC_SEL]
SCLK_LF_AUX	Used for low-power comparator in AUX_PD (COMP_B) and as clock to the recharge comparator in REFSYS	Same as SCLK_LF
ACLK_ADC	Used as clock source for ADC	Same as SCLK_HF
ACLK_REF	Used as start and stop source for time-to-digital converter (TDC)	31.25 kHz derived from 48 MHz RC oscillator 31.25 kHz derived from 48 MHz crystal oscillator 32 kHz RC oscillator 32.768 kHz crystal oscillator 2 MHz RC oscillator Selectable in [DDI_0_OSC:CTL0.ACLK_REF_SRC_SEL]
ACLK_TDC	Used as clock for TDC	48 MHz from RC oscillator 24 MHz from RC oscillator 24 MHz from crystal oscillator Selectable in [DDI_0_OSC:CTL0.ACLK_TDC_SRC_SEL]

Note:

When the 48 MHz crystal oscillator is enabled (by selecting XOSCHF as source for SCLK_HF), the XOSCHF must not be turned off, or SCLK_HF source must not be changed to another source, before the XOSCHF is reported as stable and switched to. The XOSCHF is stable when the DDI_0_OSC:STAT0.PENDINGSCLKHFSWITCHING is asserted after starting the crystal. DriverLib API should be used to switch SCLK_HF source, and interrupts must be disabled while doing so.

CAUTION:

If 31.25 kHz derived from the 48 MHz crystal oscillator is selected as the SCLK_LF source, the device must not be allowed to enter Standby mode. If the device goes to Standby with the 48 MHz crystal oscillator running, the oscillator may stop, putting the device in an unresponsive state. If the DC/DC regulator is also used, stopping the 48 MHz regulator may lead to permanent damage of the device.

Figure 8-5 System Clock Muxing