... external CLK ->system_clock• Secure Features– internal power on reset– voltage detector– frenquency detector– data encryption– clock and reset pulse filtration– safe optimized ... :2.25v(MIN), 2.5v(TYP), 2.75v(MAX)• Voltage Detector– Detect VCC range:2.8v ~3.8v for usb application ... 5.75(MIN), 6.2(TYP), 6.65(MAX).• Frenquency Detector– Detector frenquency range: FL:400KHz(MIN), 500KHz(TYP),600KHZ(MAX); ...