Hi guys,
I have a custom mega 2560 avr control board that I just got bricked by
setting the wrong fuses accidentally. It is surface mount, so i cannot
use fuse bit doctor or high voltage programming to reset it. Sadly I
also didnt include JTAG in my design. The fuses have been set to Low
frequency crystal oscillator. The only thing I have around that could
help is a USBTiny ISP programmer, and a 32khz crystal, which i hoped
would probably provide the low frequency to make it run as per the fuse
settings. I have not managed to change that until now. I am aware that
ISP programming frequency should be utmost 1/4 of the 32 khz. Is there a
way I can set ISP frequency of that level (6 to 8 khz) using avrdude and
command prompt? Probably I'll be able to reset the fuses this way.
Or if there is any other way Id bring this chip back, I'd gladly use it.