I'm planning to make a small circuit with a ATtiny85V-10PU. As the pins on this chip are very limited, there are just enough for what I'm planning to do, so all pins will be used for in- or output with LEDs and stuff connected.
When including a ISP connector to this pins, my opinion is, that connected things like LEDs etc. would use the ISP data as power source and maybe the connection could not work to programm my chip (low voltage or something like this). Is there any prevention circuit I should include to be on the safe side, or am I fully wrong?
Is there any best practice, nothing circuit specific?