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PWM output when CCR=0

Question asked by obid.matic on Mar 14, 2016

Ref. manual says that PWM output is '0' when CCR register is 0. I noticed a difference when I look output signal on a scope while CCR was set to 0. I have ARR set to 16383, timer frequency is 72 MHz. Thus, the period is 227,5 us. A pulse which occurs when CCR=0 was 26 ns wide.

Why this pulse exists even if CCR is 0? See the attached image.