Hacked Gadgets Forum

June 15, 2010

AVR Fusebit Repair Circuit

at 5:11 am. Filed under DIY Hacks, Electronic Hacks

avr_attiny_hvsp_fusebit_doctor


If you have ever set the wrong fusebit when programming your AVR have a look at this AVR Fusebit Repair Circuit which could help you repair the chip. There is also a parallel high voltage version to have a look at.

Thanks Pawel

“Did you make a mistake while programming fusebits, or purposely disabled reset pin (RSTDISBL) or ISP programming (SPIEN)? No need to buy or make inconvenient HV programmer only for unlock couple of Tiny AVR’s. This Attiny fusebit HV doctor will cure your tiny microcontrollers, by restoring all fusebits to factory settings – nice and easy.

Device uses the High-Voltage Serial Programming (HVSP) to repair fusebits. First of all patient is switched to HV memory programming, then we read signature and check if it’s supported. Then the chip erase is performed if user allows it. Next the lockbits are read, if they not set, patient receives new fusebits, proper for readed model. After that, fusebits are verified, and if they pass the test – this is end of work. If not, doctor will repeat write-verify cycle 10 times, and give up when no success.”


avr_attiny_hvsp_fusebit_doctor_4


 

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One Response to “AVR Fusebit Repair Circuit”

  1. Electronics-Lab.com Blog » Blog Archive » AVR Fusebit Repair Circuit Says:

    […] If you have ever set the wrong fusebit when programming your AVR have a look at this AVR Fusebit Repair Circuit which could help you repair the chip. [via] […]

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