Yes, we do this on a client's board with 5 PWM outputs. If you don't
have the software time/space, you could look at a PAK-V or PAK-VIII to
do the PWM externally.

Anyone on the list working with CPLDs or FPGAs? I have a PWM function in
a CPLD that you could replicate some obscene number of times on any
modern CPLD. I can't remember if it is in Verilog or Altera schematic
entry, but if anyone wants it (maybe in EDIF?) let me know - wish there
was a good list like this for programmable logic devices....

Al Williams
AWC
* 8 channels of PWM
http://www.al-williams.com/awce/pak5.htm



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Olin Lathrop
> Sent: Sunday, March 17, 2002 9:10 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:Dual USART PIC
>
>
> > I haven't encountered a situation where I needed an extra
> USART but I
> > often wish I could have more than two PWMs; three, four or
> even five
> > would be nice.
>
> Fortunately PWMs are a lot easier to do in firmware than
> UARTs, unless you need the high bandwidth.  A 20MHz PIC can
> easily take an interrupt every 100uS (500 instructions) and
> update as many PWM outputs as you like.  At 1% resolution you
> get 10Hz PWM frequency, which can be useful for many
> mechanical control applications.  I'm sure you already know
> this, Dave, but I'm pointing this out for others on the list.
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
> --
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