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stm32f103 clock (RCC) problem

Question asked by manda.maheshkarraj on Feb 5, 2015
Latest reply on Feb 5, 2015 by Clive One
Hi all,
i'm working on 103 MCU. first step is to bring up the 72Mhz clock.
problem is i'm able to get clock upto 64Mhz (tested with systick),but when i configure pll mul factor to 9 control is moving to default handler while loop in startup.c file.
crystal freq = 8Mhz that is input frequency.
so wat's the problem.
can anyone help me.