stm32f4 timer2 problem.

[jbl_raw]

Posted on June 10, 2013 at 23:19

i used timer2 and it's clock source from  APB1   and Prescaler  value for  APB1 is 4

it's mean's APB1 work at 42mhz     ''168mhz/4 ''     becuase the maximum  frequency is 42mhz for APB1.

i searched in internet and some people write the timer2 clocked at 84mhz  not 42mhz and it's true.

but i cant find in this stm32f4 datasheet

[Tesla DeLorean]

Posted on June 11, 2013 at 00:18

Yes, review the clock tree in the Reference Manual. For DIV2 on the APB it is DIV1 on the TIMCLK, for DIV4 on APB it is DIV2 on the TIMCLK