Backup Clock Normal and Pre scalar Problem

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Hi,
I am working on XMC4100, i am trying to Configue the PLL with Internal Clock i.e., Fofi with Automatic Caliberation, as per datasheet the internal clock if automatic caliberation is taken then 24Mhz will be the clock,
trying to Configure the PLL to 2Mhz in normal mode with below information

Fpll = (N / (p * k2 ));
N = 80,
P = 12,
K2 = 80

but the clock is not configuring to 2Mhz, where might be the problem??
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