title: atmega8a fuses external crystal 16MHz
body: <p>I´am working in a project with the atmel atmega8a MCU. I´ve designed a code that works with an external 16MHz crystal. For that reason i burn the atmega8a´s fuses with the AVRISPmkII programer (HIGH FUSE:C9 LOW FUSE:FF) for a external 16MHz crystal. I test the functionality of the system with a atmega8a PU and this works perfectly. Now i´m trying to do the same in a PCB with the atmega8a AU but the burn fuses process don´t work in the same way. After this process the atmega8a AU MCU doesn´t work again and the programer can´t recognize it.</p>
  
  <p>It´s something different in the burn fuses process between the atmega8a PU and the atmega8a AU?
  anybody knows why happens this???</p>
  
  <p>I hope you can help me with this trouble.
  I´ll been waiting your answer.
  Thanks a lot.</p>