User manual

LPC3250 Developer’s Kit v2 - User’s Guide

Page 56

Other OEM boards can enable this mode automatically via the UART modem control signals, but this

is not possible for the LPC3250. Therefore JP20 jumpers shall be open.

Figure 32 – UART-to-USB Bridge

If JP20 jumpers are inserted it is possible that a terminal program resets the board and/or enable

service boot mode by accident.

In the software bundle with sample applications there is also a Windows application which can be used

to transfer a file to the board while it is in service boot mode. The application is available in the

software/cspc/lpc2xx/tools/LPC3250 loader directory.

1. Start the LPC3250 loader application, see Figure 33.

2. Click the ”Browse” button in the Executables - Primary Boot section and select the binary file

you would like to transfer to the board.

3. Select COM port and then click the “Enable Terminal Mode” button.

4. Click the “Load bin’s / start primary” button.

5. Hold down the SW6 button on the OEM Base Board and then press the Reset button on the

OEM Base Board. When you release the reset button the download will begin.

USB mini-B Connector

J25

Transmit LED (from board to PC)

LED38

Receive LED (to board from PC)

LED37

Automatic ISP

JP20

Default: not inserted