Generating 1Mhz PWM with STM32F407(Discovery Board)

Posted on March 17, 2015 at 15:32

Ok, it helps to understand what you're doing rather than use tools that hide the detail.

Your system file suggests the timer is clocking at 64 MHz, not 168 MHz

To get 1 Hz you need to count 64000000 ticks at 64 MHz. A simple factoring of this gives

1000 x 64000

So

Prescaler = 1000 - 1;

Period = 64000 - 1;

Pulse = 64000 / 2; // Half of the Period