NXP Semiconductors K22F series, Reference Manual, Page: 540 / 1407

• Internal or external reference clock can be used as the FLL source.
• Can be used as a clock source for other on-chip peripherals.
• Phase-locked loop (PLL):
• Voltage-controlled oscillator (VCO)
• External reference clock is used as the PLL source.
• Modulo VCO frequency divider
• Phase/Frequency detector
• Integrated loop filter
• Can be used as a clock source for other on-chip peripherals.
• Internal reference clock generator:
• Slow clock with nine trim bits for accuracy
• Fast clock with four trim bits
• Can be used as source clock for the FLL. In FEI mode, only the slow Internal
Reference Clock (IRC) can be used as the FLL source.
• Either the slow or the fast clock can be selected as the clock source for the MCU.
• Can be used as a clock source for other on-chip peripherals.
• Control signals for the MCG external reference low power oscillator clock generators
are provided:
• HGO, RANGE, EREFS
• External clock from the Crystal Oscillator :
• Can be used as a source for the FLL and/or the PLL.
• Can be selected as the clock source for the MCU.
• External clock from the Real Time Counter (RTC):
• Can be used as a source for the FLL only.
• Can be selected as the clock source for the MCU.
• External clock monitor with reset and interrupt request capability to check for
external clock failure when running in FBE, PEE, BLPE, or FEE modes
• Lock detector with interrupt request capability for use with the PLL
Introduction
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
540 NXP Semiconductors