first : For some reason there are NO pullup resistors on the MCB2103 board pin GPIO 0.17 and 0.18 both are open drain outputs. Thats why 2 leds will not blink with the blinky example. If you try the example from http://www.keil.com/download/docs/232.asp?bhcp=1 (blinky_irq ) it will not run on the MCB2103 board, the LPC2103 seems to have another PINSEL0 definition than LPC2104 ! to get it working on the board change the line PINSEL0 = 2 << 28 to line PINSEL0 = 1 << 28 The Pin connect block dialog in uVision will show DCD1 ,this is becorse the dialog does not match the LPC2103 pinsel0 definition, however the app. will run ON THE TARGET MCB2103 only. I hope philips soon releases its LPC2103 user manual. PINSEL0 = 2 << 28 on the MCB2103 board will cause the pin function to be SPI CLK out, for that reason you will see the EINT pin been pulled low when you try to run the unmodified blinky_irq example on an MCB2103 .
"there are NO pullup resistors on the MCB2103 board pin GPIO 0.17 and 0.18 both are open drain outputs. Thats why 2 leds will not blink with the blinky example." Surely, you wouldn't want pullups if you were going to flash LEDs? You'd connect the LED cathode to the Open-Drain pin, and the LED anode via a current-limiting resistor to Vcc?
agree ,but the GPIO signals from the LPC2103 go to a LVC244 driver who drives the leds. So those leds connected on the MCB2103 will never blink. unless you use the breadboard area to add some pullups.