I have noticed a strange behavior with fast PWM.

ATmega128.

WGM mode 5
COM1A[1:0]=2
clk/8

The waveform on B[5] behaves normal for all values I have checked, except for OCR1A=127!

With OCR1A=124, I see a waveform high for 63 usec, period of 126 usec.
With OCR1A=127, I see a waveform high for 3.1`usec, period of 126 usec.
With OCR1A=130, I see a waveform high for 68 usec, perios of 126 usec.

I cannot find an explanation in the datasheet.

What am I missing?

Tom Dean

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