Posted on May 17, 2011 at 12:40Looking at the STM32 Clock Tree I have SYSCLK=72 MHz. The APB1 Prescaler is set to /2 sending a 36 MHz PCLK1 to APB1 peripherals.
That same 36 MHz clocks TIM2 to TIM7.
That’s what I thought until TIM3 setup to make a 1 KHz interrupt actually made a 2 KHz interrupt. Then I saw something - - there is a x1, x2 multiplier between my 36 MHz APB1 clock and the timers.
What register does one set to specify x1 or x2? There is an equivalent x1, x2 multiplier before timer 1 and timer 8. I suspect the docs for both controls are tucked away where I can’t find them. I have looked. Silicon Valley ST support sent my request for documentation “back through Technical support� whatever that means.
Does someone here know where thicontrol is?
