I have a pre-programmed ATTiny45 and six unprogrammed ATTiny45's. I want to program the six unprogrammed IC's to be identical to the one programmed ATTiny45 that I have. However, I can't get the ATTiny45 into ISP mode.
I've got an STK500v2 and by wiring it up for HVSP mode I seem to be able to read off the Flash and EEPROM and save them to Hex files.
The fuse bits show up as being Ext - 0xFF High - 0xFF Low - 0xFF. That's all fine, but if I try to change any of the fuse bits on the already programmed tiny, AVR Studio (4.17) just reports back an error trying to program the fuse bits.
I took one of my new tiny's, set the fuse bits to 0xFF 0xFF 0xFF (it still lets me re-program them to something else, unlike the original). I also downloaded the flash and eeprom onto the new chip, but the new chip does not work when plugged into the same socket as the original chip (and yes, the original chip is working).
Any help? I'd be happy to provide more information