Table 19-3. SCG modes of operation (continued)
Mode
Description
• RUN MODE: 0011 is written to RCCR[SCS].
VLRUN MODE: Invalid mode. Programming SCG into FIRC mode will be ingored.
HSRUN MODE: 0011 is written to HCCR[SCS].
• FIRCEN = 1
• FIRCVLD = 1
In FIRC mode, SCGCLKOUT and system clocks are derived from the fast internal reference clock.
Four frequency range settings are available for FIRC clock as described in the FIRC[RANGE]
register definition. Changes to FIRC range settings will be ignored when FIRC clock is enabled.
Information regarding FIRC operation during normal and low power stop modes is found in the
.
Sys PLL (SPLL)
Sys PLL (SPLL) mode is entered when all the following conditions occur:
• RUN MODE: 0110 is written to RCCR[SCS].
VLRUN MODE: Invalid mode. Programming SCG into SPLL mode will be ingored.
HSRUN MODE: 0110 is written to HCCR[SCS].
• SPLLEN = 1
• SPLLVLD = 1
In SPLL mode, the SCGCLKOUT and system clocks are derived from the output of PLL which is
controlled by either the System Oscillator (SOSC) clock or the Fast internal reference clock (FIRC).
The selected PLL clock frequency locks to a multiplication factor, as specified by its corresponding
SCG_SPLLCFG[MULT], times the selected PLL reference frequency. The PLL's programmable
reference divider must be configured to produce a valid PLL reference clock. This divide value is
defined by the SCG_SPLLCFG[PREDIV] bits.
Information regarding SPLL operation during normal and low power stop modes is found in the
.
Stop
Entered whenever the MCU enters a Stop state. The power modes are chip specific. For power
mode assignments, see the chapter that describes how modules are configured and SCG behaviour
during Stop recovery. Entering Stop mode, all SCG clock signals are static except the following
clocks which can continue to run and stay enabled in the following cases:
SIRCCLK is available in Normal Stop and VLPS mode when all the following conditions become
true:
• SIRCCSR[SIRCEN] = 1
• SIRCCSR[SIRCSTEN] = 1
• SIRCCSR[SIRCLPEN] = 1 in VLPS
FIRCCLK is available only in Normal Stop mode when all the following conditions become true:
• FIRCCSR[FIRCEN] = 1
• FIRCCSR[FIRCSTEN] = 1
SOSCLK is available in following low power stop modes (Normal Stop, VLPS) when all the below
conditions are true.
• SOSCCSR[SOSCEN] = 1
Chapter 19 System Clock Generator (SCG)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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