А вот и ответ от Atmel про ток диодаQ : Hi! Would you please tell the maximum permissible DC and pulse diode clamp current at device terminals?
A:1mA continously without destroying or reducing the AVR's life. Short pulses can be a lot higher, but we have no number we can guarantee.
Best Regards,
Jan H. Ugelstad
Atmel AVR Technical Support