Firstly, a confession: until recently, I regarded clock generation as a Black Art and, whilst quite happy with the concept of clock division, could not get my head around FLL/clock multiplication. That is, until I read this article: http://blogs.freescale.com/2012/08/20/the-bare-metal-enthusiast-winding-the-clock/
Reading this made the FLL concept a lot clearer, and left me only slightly flummoxed
Having a quick search, I have found that I can clock a Kinetis part using the EXTAL32 pin to feed a 32kHz into the clocking system. Can I achieve the same with HCS08 (specifically, MC9S08AC128,) with only the EXTAL pin?
My reason for asking is that I would like to run a high-accuracy RTC, using a DS32KHZ TCXO as the clock source.