Content originally posted in LPCWare by rmteo on Sat Apr 10 17:41:58 MST 2010
Look at section 8 (page 53) of the Base Board manual - reason #2.
Quote:
[B]8 Troubleshooting[/B]
8.1 The Board is Always in Reset
Reason 1: If a terminal application, such as Tera Term, is connected to the COM port associated with the board and at the same time have the J54 jumpers (see Figure 21) inserted, the terminal application might be the cause of this problem. If the terminal application is pulling DTR low the board will be reset and if it pulls RTS low it will control the bootload enable functionality.
Solution 1: Remove the jumpers and try again (please note that the jumpers must be inserted if the board is programmed using the UART boot mode).
Reason 2: If the board is [COLOR=Red][B]powered only through the USB interface[/B][/COLOR] on the LPCXpresso LPC1343/LPC1114 Board (interface 2 as shown in Figure 3) the FTDI USB-to-UART bridge won’t be powered. The output pins such as RTS and CTS might then have a low output. If the J54 jumpers, see Figure 21, are inserted the board will always be in reset.
Solution 2: Power the board also through USB interface 1, as shown in Figure 3, or remove the J54 jumpers.