Content originally posted in LPCWare by Rob65 on Sat Nov 12 00:17:49 MST 2011
No,
JTAG does not allow to place two controllers in parallel.
If you want to program another (lpc1xxx) controller without separating your board, you can just cut the traces on the PCB. Gently cut away the traces on the pins 3, 5, 7, 9 and 11 of J4. This only cuts the JTAG wires but leaves the power wires (thicker traces) in place.
Then solder a 16 pin header on the board; places jumper when you want to use this board's controller or a cable to connect to a different controller.
Please note that some controllers only support SWDIO, for those you only need the JTAG_TMS_SWDIO, JTAG_TCLK_SWCLK, JTAG_TDO_SWO and optionally the JTAG_RESET signals to be connected.
Rob
