RE: How to play PWM sequence of the variable frequency and constant duty cycle

bojan — Tue, 17 Sep 2019 07:10:50 GMT

Thank you very much for pointing out that for me. Indeed, I was able to benefit from the PWM waveform mode!

Thanks once again!

RE: How to play PWM sequence of the variable frequency and constant duty cycle

Dmitry — Fri, 13 Sep 2019 22:55:34 GMT

Hi Bojan,

Yes, there is a waveform mode that can change both frequency and duty cycle. Here's its description from spec:

A special mode of operation is available when DECODER.LOAD is set to WaveForm. In this mode, up to
three PWM channels can be enabled - OUT[0] to OUT[2]. In RAM, four values are loaded at a time: the
first, second and third location are used to load the values, and the fourth RAM location is used to load the
COUNTERTOP register. This way one can have up to three PWM channels with a frequency base that
changes on a per PWM period basis. This mode of operation is useful for arbitrary wave form generation in
applications such as LED lighting.