PWM output when CCR=0

[matic]

Posted on March 14, 2016 at 16:07

Hi.

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.

Thanks