Atmega8a au fuses

Using Arduino Microcontrollers
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Hello everyone

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.

It´s something different in the burn fuses process between the atmega8a PU and the atmega8a AU?
anybody knows why happens this???

I hope you can help me with this trouble.
I´ll been waiting your answer.
Thanks a lot.

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juankromero:
After this process the atmega8a AU MCU doesn´t work again and the programer can´t recognize it.

Sounds like your external clock isn't working...

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It´s something different in the burn fuses process between the atmega8a PU and the atmega8a AU?

There are several online Arduino fuse calculators, at least one supports inputting fuse HEX and setting the screen display of options. Faster than digging through the ATmel data sheets.

Ray

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