Our customer has question below.
They are use the Spread Spectrum in the System PLL.
Setting are below.
CCM_ANALOG_PLL_SYS_SS =0x00DC8001 (stop=220,step=1)
Spread spectrum range=5.28MHz (1% of 528MHz )
Frequency change step=24KHz
Was set as described above, by using a timer of GPT, the period of output pulse from the GPIO becomes than 2.5% longer before setting.
This 2.5% became longer is correct ?
Please tell me the reason and calculation method to be 2.5%, also what kind of rounding in this case ?