Barry Gershenfeld <gbarry42 <at> gmail.com> writes:

>=20
> I have, what was to be a simple controller, that suddenly got an addition=
al
> job of controlling an LED backlight.  Dimming is done via PWM, and the sp=
ec
> states a max frequency around 250 Hz.  It's a PIC18LF45K22, and seems to =
be

You can use TMR2/4/6 with postscaler to generate interrupts.  Load PRx regi=
ster
with value for pulse or blank.  This will generate only 2 interrupts per cy=
cle.=20
Another way is to use CCP module with 16-bit registers (page 182 of the
datasheet), this will give you a better resolution by avoiding post-scaler.=
 In
the special event IRQ load correct values for the duration of pulse or blan=
k. =20

Sergey Dryga
http://beaglerobotics.com





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