Crystal

System Oscillator Control Status Register offset 0x100.

System Oscillator Control Status Register offset 0x100Controls and monitors the System Oscillator (SOSC), which provides high-accuracy clock generation from external crystal or clock source. SOSC typically offers the highest frequency accuracy for precision timing.

系統振盪器控制狀態暫存器，管理外部晶振時脈源

SOSC Functions:

• External crystal oscillator control (4-40 MHz typical range)
• External clock input mode for precision reference
• Clock monitoring and failure detection
• Power management and low-power modes
• Automatic gain control for reliable startup

註

SOSC Characteristics:

• Highest frequency accuracy (±20-50 ppm typical)
• Higher power consumption than internal oscillators
• Requires external components (crystal, capacitors)
• Longer startup time compared to internal sources

• Best choice for precision timing applications

  Oscillator Setup:

  // Configure for 8 MHz external crystal
  scg->sosccfg = SOSC_CRYSTAL_MODE | SOSC_8MHZ_RANGE;
  scg->sosccsr = SOSC_ENABLE | SOSC_MONITOR_ENABLE;
   
  // Wait for stabilization
  while (!(scg->sosccsr & SOSC_VALID_FLAG));