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
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?
Please check the following link:
I hope this helps, have a nice day!