20 MHz Oscillator Calibration B

  0x12 8 Configuration Change Protection Based on FUSE.OSCCFG    

20 MHz Oscillator Calibration B

Bit  7 6 5 4 3 2 1 0  
  LOCK       TEMPCAL20M[3:0]  
Access  R       R/W R/W R/W R/W  
Reset  x       x x x x  

Bit 7 – LOCK: Oscillator Calibration Locked by Fuse

Oscillator Calibration Locked by Fuse

When this bit is set, the calibration settings in CLKCTRL.OSC20MCALIBA and CLKCTRL.OSC20MCALIBB cannot be changed.

The Reset value is loaded from the OSCLOCK bit in the Oscillator Configuration Fuse (FUSE.OSCCFG).

Bits 3:0 – TEMPCAL20M[3:0]: Oscillator Temperature Coefficient Calibration

Oscillator Temperature Coefficient Calibration

These bits tune the slope of the temperature compensation.

At Reset, the factory-calibrated values are loaded based on the FREQSEL bits in FUSE.OSCCFG.