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Chapter 42
System Clock Generator (SCG)
42.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances, see the chip configuration information.
The system clock generator (SCG) module provides the system clocks of the MCU. The
SCG contains a system phase-locked loop (SPLL), a slow internal reference clock
(SIRC), a fast internal reference clock (FIRC), and the system oscillator clock (SOSC).
The SPLL is sourced by either the SOSC reference clock or the FIRC reference clock.
The SCG can select either the output clock of the SPLL or a SCG reference clock (SIRC,
FIRC, and SOSC) as the source for the MCU system clocks. The SCG also supports
operation with crystal oscillators, which allows an external crystal, ceramic resonator, or
another external clock source to produce the external reference clock (which are also
available as clock sources for the MCU systems clocks).
42.1.1 Features
Key features of the SCG module are:
• System Phase-locked loop (SPLL):
• Voltage-controlled oscillator (VCO)
• Selectable Internal or External reference clock is used as the PLL source
• Modulo VCO frequency divider
• Phase/Frequency detector
• Integrated loop filter
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
1055
Содержание K32 L2A Series
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