I want to program an AVR attiny2313 with my AVR ISP MKII So I built a header that connects to a breadboard where I want to burn the firmware to the ATTiny via ISP, so my question is, I have a design that uses an external Crystal of 16MHz but I don't have space on the actual protoboard for the ISP header, so can i upload the firmware with out a Crystal [will configuration of fuses work?] and then use it the proper external Crystal ?