AVR rstdisbl fuse bit unprogrammer ...

[hm_fa_da]

rstdisbl

Dear all,

do you have a schematic or know link of a project wich can be used for unprogramming rstdisbl and spien fuse bits ?
cause they can be programmed by ISP prorgrammer but can't be unprogrammed by ISP any more so a high voltage programmer should be used ...
i found a project for high voltage programmer, but if there is a circuit wich only erase those fuse bits, it would be more interesting ( i think i have seen it some where ! but don't remember exactly ... )

Thanks & Regards.

 

[manish12]

rstdisbl isp

plz specifies in short what you need ?

Added after 17 seconds:

plz specifies in short what you need ?

 

[nandhu015]

avr hvpp

I think you are talking about AVR micros.

There is no such thing.

HVPP (high voltage parallel programmer) will do the job

Nandhu

 

[hm_fa_da]

spien fuse

Thanks,

i know high voltage parallel programmer can do it but i am sure there is a simpler circuit for just unprogramming those two fuse bits then it can be programmed usnig
ISP, cause i had made that circuit years ago, but now i can't find it in internet !
in fact a programmer needa a PC to work but the circuit wich i say, doesn't need PC and it only changes RSTDISBL and SPIEN so the Micrcontroller can be programmed in ISP mode ...

Thanks & Regards .

 

[nandhu015]

attiny85 rstdisbl

A standalone programmer is very good choice.

As far as i know there is no such thing and only a HVPP can do that job. It is not possible to reset fusebits with ISP.

Better have a HVPP.

Nandhu

 

[ctownsend]

rstdisbl avr

You did not specify which avr you are programming?
here's one for atmega series:
https://www.avrfreaks.net/index.php?module=Freaks Files&func=viewFile&id=3097&showinfo=1

If you have an attiny device, do a search on avrfreaks or google for attiny HV serial programmer. You will find what you need.

Good Luck

 

[JohanKrava]

avr rstdbl

Ask Google:

https://www.google.com/search?hl=en...num=0&ct=result&cd=1&q=AVR+programmer&spell=1