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How to set fuse bits for atmega128?

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anhnha

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I am programming to send and receive data between PC and USART of atmega128 but my program isn't work! After considering this, I think that the problem is the fuse bits. I am new to this and I have no idea to do it, could anyone who has experience advice me about:
1) I am using AVR STUDIO 4, what software I have to install to set fuse bit?
2) Do I need to set fuse bit when I just simulate in proteus?
3) What kind of fuse bit I have to set or clear?
Hope anyone can help or give me a link to that!
Thanks.
 

The fuse bits available in each mcu model are described in the datasheet in the memory programming section.

The main fuses you need to set are usually the ones related to the clock source selection.
If you want to use the jtag pins as I/O then you need to disable JTAGEN.
Don't change SPIEN because it can disable the serial programming.

Proteus models have also fuses, to set them double click the mcu in the schematic.

Here is a fuse calculator you can use
http://www.engbedded.com/fusecalc

- - - Updated - - -

All programmers can write or read the fuses too, if your programmer is recognized in AVR studio then you can use that interface, if not use the interface available in your programmer software.

I personally use USBasp with avrdude and as fronted http://avr8-burn-o-mat.aaabbb.de/avr8_burn_o_mat_avrdude_gui_en.html
 
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