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Hi!
Assuming the 16F88 has a hardware PWM module (I don't know the part
personally), why not just use 8 pins on a single port of each device?
Have the F88 sit in a tight loop just doing MOVF PORT, W; MOVWF PWM; and
dump the desired brightness to the port on the 18F252.

You might get word tearing due to propagation delay now and then but
honestly, for the sake of the brightness of an LED, who cares? It'll
only be at the edges of a brightness transition anyway.

If you don't have 8 pins and don't need 256 levels of brightness,
substitute a smaller number. :)

Chris

piclist@ian.org wrote:
[snip]
|
| I am pondering setting up a 16F88 to just do the PWM output.. it
should be
| able to easily handle three of them at once and still read the input from
| the 18F252.  Anyone have a good suggestion on how to communicate to the
| 16F88?  I have plenty of pins, but it needs to be FAST so I can tell
it to
| switch the lines on and off exactly when I want them, at the brightess I
| want as well.
|
| --
| Ian Smith

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