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Can't Set PLLI2SCFGR

Question asked by viveros.solomon on Mar 18, 2014
Latest reply on Mar 18, 2014 by viveros.solomon
I'm trying to configure the I2S pll for what will ultimately be 8KHz sampling and using the STM32F4xx_ClockCOnfiguration_V1.1.0, I get values of 

PLLI2S_N = 256
PLLI2S_R = 5

for a crystal of 8MHz and HCLK at 168MHz...

Even when I go to system the system init c file, I step through the portion of code that sets the values before enabling the pll and  R = 3, N = 258 initially; I can modify the R register when viewing the registers within keil, but I can't modify what would be N -- any suggestions on what I can try would be much appreciated.

Processor: STM32F405RGT6

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