NXP Semiconductors K22F series, Reference Manual, Page: 577 / 1407

Chapter 26
Oscillator (OSC)
26.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances, see the chip configuration information.
The OSC module is a crystal oscillator. The module, in conjunction with an external
crystal or resonator, generates a reference clock for the MCU.
26.2 Features and Modes
Key features of the module are listed here.
• Supports 32 kHz crystals (Low Range mode)
• Supports 3–8 MHz, 8–32 MHz crystals and resonators (High Range mode)
• Automatic Gain Control (AGC) to optimize power consumption in high frequency
ranges 3–8 MHz, 8–32 MHz using low-power mode
• High gain option in frequency ranges: 32 kHz, 3–8 MHz, and 8–32 MHz
• Voltage and frequency filtering to guarantee clock frequency and stability
• Optionally external input bypass clock from EXTAL signal directly
• One clock for MCU clock system
• Two clocks for on-chip peripherals that can work in Stop modes
Functional Description describes the module's operation in more detail.
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 577