ARM Technical Support Knowledge Articles

USING ULINK2 ON LPC2000 DEVICES

Applies to: ULINK USB-JTAG Debugger

Answer


Information in this article applies to:


PROBLEM

Custom boards using LPC2000 devices that download and debug with the ULINK JTAG adapter do not work properly with ULINK2 JTAG adapter.

CAUSE

This problem is typically caused by a component (such as a voltage supervisor) that is connected to the JTAG RESET pin. If the component draws too much current, it could prevent ULINK2 from controlling the /RESET signal.

The older ULINK adapter is more tolerant of components that draw higher-than-normal current connected to the /RESET pin. ULINK2 expects standard digital current draw on that pin.

RESOLUTION

One solution is to install a 1K ohm resistor between the component and the RESET pin. This reduces the amount of current required to control the /RESET signal and allows ULINK2 to work.

SEE ALSO

ATTACHED FILES

Request the files attached to this knowledgebase article.

Article last edited on: 2007-09-20 12:22:32

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