Segger J-Link User Manual page 274

274
JTAG connector
J-Link
* NTRST and RTCK may not be available on some CPUs.
** Optional to supply the target board from J-Link.
10.1.1.2 Pull-up/pull-down resistors
Unless otherwise specified by developer's manual, pull-ups/pull-downs are recom-
mended to 100 kOhms.
10.1.1.3 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
power on
power off
power on perm
power off perm
Table 10.2: Command List
J-Link / J-Trace (UM08001)
CHAPTER 10
Typical target connection for JTAG
19**
5V supply
1
VTref
3*
nTRST
5
TDI
7
TMS
9
TCK
11*
RTCK
13
TDO
15
RESET
20
GND
Switch target power on
Switch target power off
Set target power supply default to "on"
Set target power supply default to "off"
Target interfaces and adapters
Target board
Voltage
19
Regulator
1
3
nTRST
5
TDI
7
TMS
9
TCK
11
RTCK
13
TDO
15
nRST
20
Explanation
© 2004-2013 SEGGER Microcontroller GmbH & Co. KG
VCC
VCC
CPU
GND