In STM32F100 If we are connecting 32MHz external Clock, How do we obtain 17MHz System clock?
By using PREDIV and PLLMUL
Hi Anand Krishnan,
Please note that the maximum allowed value for external clock source is 24 MHz (refer "External clock source characteristics" sections in the datasheet).
I advise you to use the STM32CubeMX tool that should help you to calculate PLL mul and div factors depending on your input clock source and the expected output value.
It might be challenging as the options are limited, and 17 is a prime number
You'd have more options with an F2 or F4 part.
Perhaps with a PLL factor of two, if you manage to find a 8,500 MHz quartz.
But as said, never from 32MHz.
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