James, You can also use high voltage parallel programming mode to set fuses even when serial communication is not possible (oscillator set incorrectly, reset pin disabled, debugwire enabled, etc.).
A while back I made a simple circuit to allow an Arduino to parallel program the ATmega44/88/168/328. You can try using a circuit like this if the fix wlewis posted fails. I believe the STK500 and the AVR Dragon also support HVPP. Jeff Keyzer j...@mightyohm.com On Sep 5, 2010, at 1:29 PM, wlewis wrote: > > Hi.. I was able to "revive" a completely wacked out atmega32 by the > following: > > KEY -> attach a 12mhz xtal (instead of a 16mhz xtal) > > code for default with jtag disabled: > avrdude -p m32 -b 19200 -P COM3 -c avrisp -V -F -e -u -U lock:w:0×3F:m -U > lfuse:w:0xe1:m -U hfuse:w:0xd9:m > > then re-attach your 16mhz xtal and use this: (defaults for 16mhz xtal / jtag > disabled / fast power-up): > avrdude -p m32 -b 19200 -P COM3 -c avrisp -V -F -e -u -U lock:w:0x3F:m -U > lfuse:w:0xef:m -U hfuse:w:0xd9:m > > > //...how sweet it is > > > > > James Pascoe wrote: >> >> Hi All, >> >> Apologies for the following question which is very OT, but there is a >> good chance you guys can help. >> >> I am using an ATMega32 and inadvertantly programmed the fuse bits wrong >> :-( ... instead of setting >> the fuse bits to use a 16 Mhz external crystal as the clock source, I >> programmed the chip to use the low frequency >> crystal oscillator setting. Of course now, I can not program the device >> anymore. >> >> Does anybody know if there is any way (other than getting hold of a >> 32.768 Khz crystal) that I can recover the device ? >> >> Many thanks for any suggestions, >> >> James >> >> >> _______________________________________________ >> AVR-GCC-list mailing list >> AVR-GCC-list@nongnu.org >> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list >> >> > > -- > View this message in context: > http://old.nabble.com/ATMega32-fuse-bit-problem-tp12189077p29627870.html > Sent from the AVR - gcc mailing list archive at Nabble.com. > > > _______________________________________________ > AVR-GCC-list mailing list > AVR-GCC-list@nongnu.org > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
