RE: Not able to generate required sinewave using PWM and TIMER

Turbo J — Wed, 25 Feb 2026 13:39:41 GMT

Read the datasheet chapter about the PWM peripherial again. You are trying do do things that simply won't work.

The (max) base frequency is 16MHz, and using 9 Bits requires 512 steps. That yields a max PWM refresh frequency of 16Mhz/512 = 31,250Hz.

But 1.5Khz with 128 cycle values would require a refresh rate of 192,000Hz - far above hardware specs.

My recommendation: Ditch the TIMER altogether, use PWM auto refresh and calculate your 1.5Khz sine wave points using 31,250Hz base frequency. You may need to be a bit clever in calculation buffer length here, too - I don't think those frequencies match neatly.