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Forum: µC & Digital Electronics How to solve the AVR microcontroller fuse bit lock-up problem


von Cliff W. (cliff)


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How to solve the AVR microcontroller fuse bit lock-up problem?

von matzetronics (Guest)


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Erasing the entire chip will also reset the fuses.

von Axel S. (a-za-z0-9)


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Cliff W. wrote:
> How to solve the AVR microcontroller fuse bit lock-up problem?

Depends on what exactly is the problem.
There is no single "the fuse bit lock-up problem".

Clock Fuses? → use external clock
Reset redefined as debugWire? → attach debugger
Reset disabled? → HV programmer needed

A simple one-fits-all solution can be found by googling for "fuse 
resetter" or "fuse doctor". This is a one-purpose HV programmer that 
issues a chip-erase.

von EAF (Guest)


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matzetronics wrote:
> Erasing the entire chip will also reset the fuses.
No!
Only the lock Bits.


Only High Voltage Programming can fix all Fuse Problems.

von stefanus (Guest)


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Cliff W. wrote:
> How to solve the AVR microcontroller fuse bit lock-up problem?

Think twice before clicking on the start button.

All other solutions cost more than they are worth. Unless you are so 
stupid to repeat the same mistake dozens of times.

von stefanus (Guest)


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matzetronics wrote:
> Erasing the entire chip will also reset the fuses.

I assume that TO means situations where he locked himself out, so he 
cannot erase the chip anymore.

von ... (Guest)


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With a parallel programmer there is no lockout problem.

You get what you pay for.

von Christoph db1uq K. (christoph_kessler)


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