Delay from CKT_EN to CK_CNT

KSun.11 · ‎2020-03-20

In the RM0008, Figure 120 on page 379, it says "as soon as the CEN bit is written to 1, the prescaler is clocked by the internal clock, CK_INT. " as shown below. However in the figure, the CK_CNT appears 2 cycles after the CEN bit became 1. Given the prescale ratio of 1, I wonder how to explain that there are 2 cycles before the CK_CNT follows the response.

Why two cycles?

waclawek.jan · ‎2020-03-20

IIRC this or similar question has been discussed here maybe last year, and even answered by ST insider. Try searching the forum.

JW

KSun.11 · ‎2020-03-20

Sorry, I am new to this forum. And I did search when key in my subject title, but maybe I searched for the wrong keywords.

KSun.11 · ‎2020-03-20

Oh, I found one posted six months ago.

https://community.st.com/s/question/0D50X0000BFzSF7SQN/how-timers-in-stm32f7-start-workig

It is exactly I am asking... but I still don't get the conclusion. So it is manual errors? How can I teach this to my students...