fuse bits

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Can anyone help? I am very new to the atmel processor's in general.
I am using a atmega163. I am confused about the fuse bits. The literature
seems to indicate that these bits can be programmed and then unprogrammed.
The name at least to me seems to imply that once you program a fuse bit that
is it. Any input would be appreciated.

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Hello,

The difference between fuse and lock bits is that chip erase doesn't change the fuse bits.
Some fuses can't be programmed in serial programming mode (ISP).

Tommi

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A fuse bit can be changed from programmed to unprogrammed and vice versa and as such contradicts the normal view of a fuse. As Tommi points out, some of them can be changed in parallel mode only and they are not affected by a chip erase. Also note that they cannot be changed when the lock bits are set. If the lock bits are set and a fuse change is required, you will need to erase the device, reprogram the device, change the fuses and relock the device.

Gaute, Atmel AVR Tech Support

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