On 9 Mar 2017, at 21:50, "Byron G. Jacquot" <thescum at surfree.com> wrote: >> I’m just wondering where the number 62.5 comes from. > > It's 1/16th of 1000? I recently "discovered" this by getting a 62.5KHz PWM frequency from a 16MHz clock. 16MHz/256 = 62.5KHz.