Forums

Increase resolution for a high frequency PWM on DSP56803

Started by Bruno Tremblay January 17, 2003
Hi,

Is it possible to increase the resolution for the PWM output when using
it at a frequency of about 100kHz? I looked at the chapter 11 of the
user's manual and I didn't found my answer. Can I put an external fast clock
on an input to speedup timer the PWM timer/counter.

Thanks

Bruno



RE: [motoroladsp] Increase resolution for a high frequency PWM on DSP56803

Section 11.5.2 states that the PWM peripheral runs off the bus clock which is at 40 Mhz maximum!
to run at 100Khz that would leave a maximum resolution of 400 counts per PWM period. or a modulus of 400 if edge aligned, or 200 if center-aligned!

I am not aware of any method that would allow you to increase the resolution beyond 400 counts at 100Khz.

Jerry.

-----Original Message-----
From: Bruno Tremblay [mailto:b...@gentec.ca]
Sent: Friday, January 17, 2003 8:36 AM
To: m...@yahoogroups.com
Subject: [motoroladsp] Increase resolution for a high frequency PWM on
DSP56803


Hi,

Is it possible to increase the resolution for the PWM output when using
it at a frequency of about 100kHz? I looked at the chapter 11 of the
user's manual and I didn't found my answer. Can I put an external fast clock
on an input to speedup timer the PWM timer/counter.

Thanks

Bruno



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