My code and external circuitry are working great using the 8515 embedded in in the STK500.
So I built a cut down version of my target circuitry (AVR, external crystal, 2x 22pF caps and /RESET tied to Vcc thru 1K) to run standalone from the STK500, but to use the 6-pin ISP programming interface from the STK500 to update the s/w as required.
To keep things simple for now, I'm powering the external circuit from the VTG connector on the 6-pin - current draw is minimal and I have 5v on the target circuit OK.
But with a brand spanking new ATMega8515 in circuit I get all the symptoms of not having an AVR at all :-(
...the STK cannot read any fuses, do any updates etc etc
Do I need to initially program the 8515 in the STK500 for the right fuses and oscillator etc, or is there some other gotcha that I'm obviously unaware of?
(I could just try it, but I'm at work at the mo, but can't get the problem outta my mind!)