21.2 Features

The following are key features of the OSCCTRL module:

  • 48 MHz Crystal Oscillator (XOSC48)
    • Supports up to two 4 MHz to 48 MHz crystal oscillators
    • Tunable gain control
    • Programmable start-up time
    • Crystal or external input clock on XIN I/O
    • Clock failure detection with safe clock switch
    • Clock failure event output
  • Digital Frequency Locked Loop (DFLL48M)
    • Internal oscillator with no external components
    • 48 MHz output frequency
    • Operates stand-alone as a high-frequency programmable oscillator in open-loop mode
    • Operates as an accurate frequency multiplier against a known frequency in closed-loop mode
  • Up to 2 Digital Phase Locked Loop (PLLn)
    • Refer to PLL specifications for input and output frequency ranges
    • Each DPLL with up to four selectable reference clocks
    • Adjustable digital filter for jitter optimization
    • Adjustable DCO filter for a 4-stages differential ring oscillator
    • Fractional part used to achieve 1/16th of reference clock step
    • Embedded test mode controller