ATMEGA8 Fuse Bit Security

The first attention should be paid to
clock sources. There are Four bits controlling Atmega8 clock sources:
CKSEL0, CKSEL1, CKSEL2, CKSEL3.

Atmega8 can have 4 different clock sources:

• External Crystal or Resonator;
• External Low Frequency Crystal;
• External RC Oscillator or Calibrated Internal RC Oscillator;
• External Clock source.

THIS SAMPLE USING PONYPROG

1. 8MHz Crystal with slowly rising power:
   
2. 2MHz ceramic resonator fast raising power:
3. 32768kHz resonator stable frequency at startup:
4. External RC 4MHz oscillator with internal C enabled fast rising power:
5. If you want to drive maximum from your Atmega: then select 16MHz fast rising power: