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Table 5-2. Clock Definitions
Clock name
Description
Clock name
Description
SOSC
System Oscillator clock from the OSC module or an external squarewave input on EXTAL
pin. One of the four clock sources. References to ERCLK are to this SOSC clock
SIRC
Slow Internal RC oscillator clock (2 or 8 MHz). One of the four clock sources.
FIRC
Fast Internal RC oscillator clock (48-60 MHz). One of the four clock sources.
SPLL
System PLL clock, that is a multiple of the FIRC or SOSC. One of the four clock sources.
DIVCORE_CLK
Main clock for CPU platform and closely tighly coupled peripherals/modules. This clock is
derived from one of the four clock sources
DIVSLOW_CLK
Main clock used for peripheral/CPU interfacing and clocking the flash module. This clock is
derived from DIVCORE_CLK.
SOSCDIV1_CLK
Alternative clock for clocking peripherals tightly coupled with CPU, sourced from SOSC.
Selected via PCCn register of peripheral
SIRCDIV1_CLK
Alternative clock for clocking peripherals tightly coupled with CPU, sourced from SIRC.
Selected via PCCn register of peripheral
FIRCDIV1_CLK
Alternative clock for peripherals tightly coupled with CPU, sourced from FIRC. Selected via
PCCn register of peripheral
SPLLDIV1_CLK
Alternative clock for clocking peripherals tightly coupled with CPU, sourced from SPLL.
Selected via PCCn register of peripheral
SOSCDIV3_CLK
Alternative clock for clocking low power peripherals, sourced from SOSC. Selected via PCCn
register of peripheral
SIRCDIV3_CLK
Alternative clock for clocking low power peripherals, sourced from SIRC. Selected via PCCn
register of peripheral
FIRCDIV3_CLK
Alternative clock for clocking low power peripherals, sourced from FIRC. Selected via PCCn
register of peripheral
SPLLDIV3_CLK
Alternative clock for clocking low power peripherals, sourced from SPLL. Selected via PCCn
register of peripheral
OSC32KCLK
System oscillator output clock when either a 32 kHz crystal or 32 kHz external clock source is
provide to the EXTAL pin.
LPO
PMC 1kHz output. Used to clock some periodic timers when in low power stop modes to
provide periodic wake-up or periodic interrupts. The LPO is independent of the SCG and is
controlled via the PMC module.
5.10 Clocking details
The following table provide more information regarding the on-chip clocks.
Table 5-3. Detailed Clock Summary
Clock name
Run mode - Clock
Frequency
VLPR mode -
Clock Frequency
HSRUN mode -
Clock Frequency
Clock source
Clock can be
disabled when…
DIVCORE_CLK
Up to 72 MHz
Up to 8 MHz
Up to 96 MHz
SCG
When both CPUs
are in any stop
Table continues on the next page...
Clocking details
K32 L2A Reference Manual, Rev. 2, 01/2020
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