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Originally Posted by Gdeaver
...Off loading the PWM from the pic 18's would eliminate the critical timing that is needed in the current controller...
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That is taken care of in the non-user-programmable PIC. It doesn't matter whether or not the timing is critical; it is neither exposed to nor under the control of the programming we are allowed to do.
(The four PWMs which
are optionally controllable by the user processor would still have to be that way in order to permit the kind of immediate control possible under the existing scheme.)