178 CHAPTER 5 Working with J-Link and J-Trace
J-Link / J-Trace (UM08001) ©
2004-2017 SEGGER Microcontroller GmbH & Co. KG
5.2.1.1 Single color indicator (J-Link V7 and earlier)
5.2.1.2 Bi-color indicator (J-Link V8)
Indicator status Meaning
GREEN, flashing at 10 Hz Emulator enumerates.
GREEN, flickering
Emulator is in operation. Whenever the emulator is exe-
cuting a command, the LED is switched off temporarily.
Flickering speed depends on target interface speed. At
low interface speeds, operations typically take longer and
the "OFF" periods are typically longer than at fast
speeds.
GREEN, constant Emulator has enumerated and is in idle mode.
GREEN, switched off for
10ms once per second
J-Link heart beat. Will be activated after the emulator
has been in idle mode for at least 7 seconds.
GREEN, flashing at 1 Hz
Emulator has a fatal error. This should not normally hap-
pen.
Table 5.1: J-Link single color main indicator
Indicator status Meaning
GREEN, flashing at 10 Hz Emulator enumerates.
GREEN, flickering
Emulator is in operation. Whenever the emulator is exe-
cuting a command, the LED is switched off temporarily.
Flickering speed depends on target interface speed. At
low interface speeds, operations typically take longer and
the "OFF" periods are typically longer than at fast
speeds.
GREEN, constant Emulator has enumerated and is in idle mode.
GREEN, switched off for
10ms once per second
J-Link heart beat. Will be activated after the emulator
has been in idle mode for at least 7 seconds.
ORANGE Reset is active on target.
RED, flashing at 1 Hz
Emulator has a fatal error. This should not normally hap-
pen.
Table 5.2: J-Link single color LED main color indicator
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