LPC11U68 JTAG conenction

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LPC11U68 JTAG conenction

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geoff_collins
Contributor I

Hi. I've been given a LPC11U68 based design to create a JTAG test for. I cannot get it to be recognised by an XJTAG probe. I have noticed the designer has connected the JTAG TMS signal to the SWDIO pin as the user guide states

SWDIO — Serial Wire Debug I/O. SWDIO is enabled by default on this pin. In boundary scan mode: TMS (Test
Mode Select).

And yet there is a dedicated TMS pin

TMS — Test Mode Select for JTAG interface. In boundary scan mode only.

Could this be the problem? What is different about the TMS function of these pins?

Geoff

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soledad
NXP Employee
NXP Employee

Hi, 

Please check the following link: 

https://community.nxp.com/thread/388998 

I hope this helps, have a nice day!

Regards 

Soledad

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