how to erase all the fuse bit back to the origin?

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simpsonss
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Posted by simpsonss: Fri. May 8, 2009 - 06:12 AM
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:?:
hi all,

i'm facing a serious problem which is once i wrote in the configuration and security bit of my atmega32L, atmega16L and atmega8535 IC.i found that my ic cannot be program or read any more. First i thought is because of faulty IC. but when i try again with another atmega8535 IC, i try to program, read and verify (without configure the fuse bit) it works no matter how many time i program in my hex. but once i write the fuse bit, i cant program, read or verify my atmega8535 anymore.

Can someone help me on this?

thank you.

Tags:

AVR Microcontrollers, megaAVR and tinyAVR, ATmega16, ATmega32, ATmega8, ATmega8535
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ossi
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Posted by ossi: Fri. May 8, 2009 - 06:22 AM
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What programmer do you use ?
Which fuse-bits did you set (there are many of them).

May be injection of a clock into the clock-in pin
with appropriate programming speed helps.
search for other threads here.

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simpsonss
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Posted by simpsonss: Fri. May 8, 2009 - 07:35 AM
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these are the fuse bit i set.
CKOPT
CKSEL3
CKSEL2
CKSEL1

i have a labtool universal programmer with me. But i not sure how to set back all the fuse bit.

thank you.

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simpsonss
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Posted by simpsonss: Fri. May 8, 2009 - 08:36 AM
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PROBLEM SOLVED. ANYWAY THANKS. i just use a labtool programmer to program back the default fuse bit.

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