Content originally posted in LPCWare by wwwenrico on Thu Apr 14 21:24:44 MST 2016
Hi,
read the User manual of theLPC23XX family at "Chapter 32: LPC23XX EmbeddedICE logic"
You will find a detailed description of all the JTAG pins.
Practically speaking, your board needs ONLY a pull-down resistor of 1k to 47 k on the JTAG_TCK pin
Enrico Migliore