NXP Semiconductors MKW01Z128, Reference Manual

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Table 20-3. MCG modes of operation (continued)
Mode Description
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 MCG behavior
during Stop recovery. Entering Stop mode, the FLL is disabled, and all MCG clock signals are static
except in the following case:
MCGPLLCLK is active in Normal Stop mode when PLLSTEN=1
MCGPLL1CLK is active in Normal Stop mode when PLLSTEN1=1
MCGIRCLK is active in Normal Stop mode when all the following conditions become true:
• C1[IRCLKEN] = 1
• C1[IREFSTEN] = 1
NOTE: • In VLPS Stop Mode, the MCGIRCLK can be programmed to stay enabled and
continue running if C1[IRCLKEN] = 1, C1[IREFSTEN]=1, and Fast IRC clock is
selected (C2[IRCS] = 1)
NOTE: • When entering Low Power Stop modes (LLS or VLPS) from PEE mode, on exit the
MCG clock mode is forced to PBE clock mode. C1[CLKS] and S[CLKST] will be
configured to 2’b10if entering from PEE mode or to 2’b01 if entering from PEI mode,
C5[PLLSTEN0] will be force to 1'b0 and S[LOCK] bit will be cleared without setting
S[LOLS].
• When entering Normal Stop mode from PEE mode and if C5[PLLSTEN]=0, on exit
the MCG clock mode is forced to PBE mode, the C1[CLKS] and S[CLKST] will be
configured to 2’b10 and S[LOCK] bit will clear without setting S[LOLS]. If
C5[PLLSTEN]=1, the S[LOCK] bit will not get cleared and on exit the MCG will
continue to run in PEE mode.
NOTE
For the chip-specific modes of operation, see the power
management chapter of this MCU.
20.4.1.2 MCG mode switching
C1[IREFS] can be changed at any time, but the actual switch to the newly selected
reference clocks is shown by S[IREFST]. When switching between engaged internal and
engaged external modes, the FLL will begin locking again after the switch is completed.
C1[CLKS] can also be changed at any time, but the actual switch to the newly selected
clock is shown by S[CLKST]. If the newly selected clock is not available, the previous
clock will remain selected.
The C4[DRST_DRS] write bits can be changed at any time except when C2[LP] bit is 1.
If C4[DRST_DRS] write bits are changed while in FLL engaged internal (FEI) or FLL
engaged external (FEE) mode, the MCGOUTCLK switches to the new selected DCO
range within three clocks of the selected DCO clock. After switching to the new DCO
Chapter 20 Multipurpose Clock Generator (MCG)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc. 355