I think the pull-ups are the culprit.
RRST - Reset Pull-up Resistor: 30 k? min, 60 k? max
Rpu - I/O Pin Pull-up Resistor: 20 k? min, 50 k? max
Do the math...
The 1284P is in an entirely different class than the 2560.
Darn spell-checker!
Ray
I think the pull-ups are the culprit.
RRST - Reset Pull-up Resistor: 30 k? min, 60 k? max
Rpu - I/O Pin Pull-up Resistor: 20 k? min, 50 k? max
Do the math...
The 1284P is in an entirely different class than the 2560.
Darn spell-checker!
Ray