> I'm using a 16f84 to drive an IR led but i'll need to modulate it at
38kbps.

You have as PIC, what else do you need? 38 kHz is a few instructions
high, a few instructions low. (How much depends on your clock and is
left as an excecise for the reader. advanced: driver the LED 1/3 on, 2/3
off)

Wouter van Ooijen

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