14.2 Features

The following are key features of the SYSCTRL module:

  • 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
  • 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