sthng already solved.
i could sort out the problem and also the appropriate way. The clock for timer 3 is only maximum 36 Mhz.
Yet there are some confusions about TIM_GetCapturex(TIMx) function and TIMx->CNT.
If anyone can explain i would be greatful.
Thnks in advance.
You will get a better response here [STM32F Forums - remember to use tags.](https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/AllItems.aspx)
thnks rmteo,
yeah i wud try the cortex rule of 32 bits as soon as possible.
thnks.