The Atmel-ICE top panel has three LEDs that indicate the status of current debug or programming sessions.

Table 1. LEDs
LED Function Description
Left Target power

GREEN when target power is OK. Flashing indicates a target power error. It does not light up until a programming/debugging session connection is started.

Middle Main power RED when main-board power is OK
Right Status

Flashing GREEN when the target is running/stepping. OFF when the target is stopped.