[sdiy] DsPIC timer issue when used as DCO!

[Eric Brombaugh]

Karl,

I wasn't aware that there was an issue with dsPIC timers used to drive 
the P08/Mopho/(Tetra?) DCOs. Do you have any pointers to this elsewhere 
online?

I haven't used the dsPIC timers for DCO control before, but it would be 
good to know what to watch out for. My own experience with 
microcontrollers in general (and Microchip parts in particular) is that 
there are lots of undocumented 'features' and most folks with any 
experience have a mental list of where the dragons lurk.

Eric


On 12/09/2009 05:34 PM, karl dalen wrote:
> Hello!
> Have anyone found the exact source for the glitch problem in
> dsPIC timers when used as NCO's as displayed in the P08, Mopho?
> (Minor error, but anyway.)
>
> It has to do with the update of the timers registers as some folks claims?
> Timer value buffer update delay becomes progressively worse as frequency
> goes down. The rollover causes delay? As they say?
>
> But if not the case shouldn't this be matter of voice channel update
> procedure i.e pitch after end of VCA EG so the pitch change not become audible?
>
> Reg
> KD
>
>
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