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).
19.2.1 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
• Can be selected as the clock source for the MCU system clocks
• 2 programmable post-dividers clock outputs, which can be used as clock sources
for other on-chip peripherals
• 2 Internal reference clock (IRC) generators:
• Fast IRC clock with programmable High and Low frequency range
• Fast clock can be used as a source for System PLL
• Either the slow or the fast clock can be selected as the clock source for the MCU
system clocks
• 2 programmable post-divider clock outputs for each IRC, which can be used as
clock sources for other on-chip peripherals
• System Crystal Oscillator:
• Can be used as a source for the System PLL
• Can be selected as the clock source for the MCU system clocks
• Clock monitor with reset and interrupt request capability for SPLL, SOSC, clocks
• Lock detector with interrupt request capability for use with the SPLL
• Each of the clock sources have reference dividers for clocking on-chip modules and
peripherals, namely:
Chapter 19 System Clock Generator (SCG)
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