Clock name
Description
Bus clock
System clock divided by OUTDIV4.
Clocks the bus slaves and peripherals.
Flash clock
Flash memory clock
On this device, it is the same as Bus clock.
MCGOUTCLK
MCG_Lite output of either IRC48M, IRC8M, MCG_Lite's
external reference clock that sources the core, system, bus,
and flash clock.
MCGIRCLK
IRC8M/2M internal reference clock divided by lirc_div2
MCGPCLK
MCG_Lite output of the fast (IRC48M) internal reference
clock. This clock may clock some modules. In addition, this
clock is used for LPUART0, LPUART1 and TPM modules
OSCCLK
System oscillator output of the internal oscillator or sourced
directly from EXTAL. Used as MCG_Lite's external reference
clock.
OSCERCLK
System oscillator output sourced from OSCCLK that may
clock some on-chip modules
OSC32KCLK
System oscillator 32 kHz output
ERCLK32K
Clock source for some modules that is chosen as
OSC32KCLK or RTC_CLKIN or LPO
LPO
PMC 1 kHz output
5.4.1 Device clock summary
The following table provides more information regarding the on-chip clocks.
Table 5-1. Clock summary
Clock name
Run mode
clock frequency
VLPR mode
clock frequency
Clock source
Clock is disabled
when…
MCGOUTCLK
Up to 48 MHz
Up to 8 MHz
MCG_Lite
In all stop modes
except for partial stop
modes.
MCGPCLK
Up to 48 MHz
N/A
MCG_Lite
MCG_Lite and USB
clock controls are not
enabled and in all stop
modes except for partial
stop modes.
Core clock
Up to 48 MHz
Up to 4 MHz
MCGOUTCLK clock
divider
In all wait and stop
modes
Platform clock
Up to 48 MHz
Up to 4 MHz
MCGOUTCLK clock
divider
In all stop modes
System clock
Up to 48 MHz
Up to 4 MHz
MCGOUTCLK clock
divider
In all stop modes and
Compute Operation
Bus clock
Up to 24 MHz
Up to 1 MHz
MCGOUTCLK clock
divider
In all stop modes
except for partial
Table continues on the next page...
Chapter 5 Clock Distribution
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Freescale Semiconductor, Inc.
67
