In SX Microcontrollers, SX/B Compiler and SX-Key Tool, phipi wrote:

You need a series resistor for each LED to limit the current through it. Without it, you risk damaging the LED, the output pin driving it, or both. If space is an issue, you can always use resistor arrays containing isolated (as opposed to bussed) resistors.

(Okay, in theory, you [i]could[/i] use the SX's internal pullups in a common cathode configuration to "drive" the LEDs. But at 20K ohms, the room would have to be pitch dark to see the glow. :-) )

-Phil

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