I have device S9KEAZ128BVLHR. I want to know default frequency of the BUSCLK directly out of reset, assuming everything is still default, I am still running from the Internal FLL, and I have not modified any registers.
The datasheets and manual don't give an answer to this very basic question.
Hi Dudley,
The default frequency of the BUSCLK is 24MHz, it need to be calculated by using the default values of below registers.
See the "Figure 5-1. Clocking diagram" in KEA128RM.pdf, and the default values.
The default value of IREFS bit in ICS_C1 is 1, this means Internal reference clock(37.5kHz) is selected for the FLL.
Then the FLL loop locks the frequency to 1280 times the internal reference frequency.(ICSFLLCLK=37.5kHz*1280=40MHz)
The default value of CLKS bit in ICS_C1 is 00, selects the clock source (output of FLL) that controls the bus frequency.
Best Regards,
Robin
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