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Chapter 28
Oscillator (OSC)
28.1 Chip-specific OSC information
28.1.1 OSC modes of operation with MCG_Lite and RTC
The most common method of controlling the OSC block is through MCG_C1[CLKS] and
the fields of MCG_C2 register to configure for crystal or external clock operation.
OSC_CR also provides control for enabling the OSC module and configuring internal
load capacitors for the EXTAL and XTAL pins. See the
more details.
RTC_CR[OSCE] has overriding control over the MCG_Lite and OSC_CR enable
functions. When RTC_CR[OSCE] is set, the OSC is configured for low frequency, low
power and RTC_CR[SCxP] override OSC_CR[SCxP] to control the internal capacitance
configuration. See the RTC chapter for more details.
28.2 Introduction
The OSC module is a crystal oscillator. The module, in conjunction with an external
crystal or resonator, generates a reference clock for the MCU.
28.3 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)
Freescale Semiconductor, Inc.
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
OSC
and
MCG_Lite
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