I have just built a new PCB and assembled it, plugged in my AVRISP2, powered on and clicked "Read Signature" .... to be greeted with the dreaded "Entering Programming Mode....Failed" Message.
I have made the ISP connections the same as I have for many previous successful ATMEGA16 projects, but the ATMEGA64 has an extra PEN pin. Should this be hi / lo / disconnected? I have actually tried it all ways, but it would be good to know what it should be!
I know my programmer works (tested with other ATMEGA16 projects).
This is my first try at using the ATMEGA64 - I'm obviously missing some important point...
I have attached my circuit for your comments.
If someone could post a known good circuit I could copy, that would be super helpful.
I look forward to your suggestions!