Content originally posted in LPCWare by gbm on Tue Jun 18 04:35:40 MST 2013
You need 3 wires: ground-ground, PL2303 TX-LPC RX0, PL2303 RX-LPC TX0. Also, jumper or pushbutton to ground on bootloader-mode pin would be useful.
Look at the schematic of LPC1768 mini-DK board available on the net.