420 CHAPTER 16 Target interfaces and adapters
J-Link / J-Trace (UM08001) ©
2004-2017 SEGGER Microcontroller GmbH & Co. KG
16.1.1.2 Pull-up/pull-down resistors
Unless otherwise specified by developer’s manual, pull-ups/pull-downs are recom-
mended to 100 kOhms.
16.1.1.3 Target power supply
Pin 19 of the connector can be used to supply power to the target hardware. Supply
voltage is 5V, max. current is 300mA. The output current is monitored and protected
against overload and short-circuit. Power can be controlled via the J-Link com-
mander. The following commands are available to control power:
Command Explanation
power on
Switch target power on
power off Switch target power off
power on perm Set target power supply default to "on"
power off perm Set target power supply default to "off"
Table 16.2: Command List
Typical target connection for JTAG
JTAG connector
Target board
nTRST
TDI
TMS
TCK
RTCK
TDO
RESET
CPU
nTRST
TDI
TMS
TCK
RTCK
TDO
nRST
GND
Voltage
Regulator
VCC
VCC
5V supply
VTref
GND
3*
5
7
9
11*
13
15
* NTRST and RTCK may not be available on some CPUs.
** Optional to supply the target board from J-Link.
1
19**
3
5
7
9
11
13
15
1
19
J-Link
20 20
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