17.2 Features

0.4-32 MHz Crystal Oscillator (XOSC)
- Tunable gain control
- Programmable start-up time
- Crystal or external input clock on XIN I/O
32.768 kHz Crystal Oscillator (XOSC32K)
- Automatic or manual gain control
- Programmable start-up time
- Crystal or external input clock on XIN32 I/O
32.768 kHz High Accuracy Internal Oscillator (OSC32K)
- Frequency fine tuning
- Programmable start-up time
32.768 kHz Ultra Low-Power Internal Oscillator (OSCULP32K)
- Ultra low-power, always-on oscillator
- Frequency fine tuning
- Calibration value loaded from Flash Factory Calibration at Reset
8 MHz Internal Oscillator (OSC8M)
- Fast start-up
- Output frequency fine tuning
- 4/2/1 MHz divided output frequencies available
- Calibration value loaded from Flash Factory Calibration at Reset
Digital Frequency Locked Loop (DFLL48M)
- Internal oscillator with no external components
- 48 MHz output frequency
- Operates standalone as a high-frequency programmable oscillator in Open-Loop mode
- Operates as an accurate frequency multiplier against a known frequency in Closed-Loop mode
Fractional Digital Phase-Locked Loop (FDPLL96M)
- 48 MHz to 96 MHz output clock frequency
- 32 kHz to 2 MHz input reference clock frequency range
- Three possible sources for the reference clock
- Adjustable proportional integral controller
- Fractional part used to achieve 1/16th of reference clock step
3.3V Brown-Out Detector (BOD33)
- Programmable threshold
- Low-power sampling mode of operation
- Threshold value loaded from Flash User Calibration at start-up
- Triggers Resets or interrupts
- Hysteresis
Internal Voltage Regulator system (VREG)
- Operating modes:
  - Normal mode
  - Low-power mode
- With an internal non-configurable Brown-out Detector (BOD12)
Voltage Reference System (VREF)
- Bandgap voltage generator with programmable calibration value
- Temperature sensor
- Bandgap calibration value loaded from Flash Factory Calibration at start-up