MCF8329A: How does MotorStudio measure the rotation speed for MCF8329A

Tool/software:

Hello, I'm using MCF8329A to control a BLDC motor. Everything works fine so far, but the value for the Speed FDBK in MotorStudio window is about 4 times higher than a real speed value which I observe.

My BLDC Motor has 4 pole pairs (or 8 poles), so I guess the difference is related to this.

I don't find any pole settings in the datasheet except of FG_DIV in CLOSED_LOOP1 register, I tried to configure it there but without any changes of the measured values.

Where does this Speed FDBK value come from? How can i set something up so that it shows the correct value?