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I can't get data off my ARM LPC2378 microcontroller - does it need UART or can any GPIO be used?

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Could you provide some more info? Where do you want to get the info too? Those processes have lots of interfaces; Ethernet, CAN, UART, SPI, GPIO. JTAG could be used if it's only for development. You could use any of these. – Clint Lawrence Dec 2 '09 at 0:39

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You need a level converter to actually use the UART (connecting to a PC, for example).

Check out this schematic Keil eval board

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If you're talking about connecting the processor's UART to a PC's serial port, you can now get USB to RS232/TTL converters. One end goes into your PC's USB socket, and appears as a normal serial port; the other comes out to 5 V or 3.3 V signals that can be connected directly to your processor, with no level-shifting required.

We've used TTL-232R-3V3 from FDTI Chip, which works perfectly for this kind of application.

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