Need to drive 4 rgb leds, but have only 1 pin available...

[Ioannis]

Yes, you are right. Forgot that, sorry!

Ioannis

[mpgmike]

If you are trying to get a specific color from your RGB, and you aren't needing to change that color, use different value resistors from VREF to your individual LED legs and use the PIC to provide ground. For brightness control, you could use that one PWM pin on your PIC and vary duty cycle. You wouldn't be able to change the colors, due to the fixed resistors.