Can't reach 96MHz frequency with MCBSTR9

Hello,

I've been working with a board MCBSTR9 and I thought I had correctly configured the PLL so that I was working at the maximum frequency.

However, revising the configuration in the startup file provided by Keil, I've seen that the following values were set in the PLL configuration:

P = 3; N = 192; M = 25

, which, according to all the manuals I've seen, produces an fPLL frequency of 48MHz (the oscillator's frequency is 25MHz).

So, I changed the value of P to 2, to theorically get a frequency of 96MHz. However, the board don't even start running.

I changed the parameters to several values which should produce a 96MHz output in the PLL, but nothing worked. Restoring a frequency of 48MHz works fine.

I can't see where's my mistake. What am I doing wrong?

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