About the Fsys of SPC5633mmlq60

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About the Fsys of SPC5633mmlq60

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xuzheng
Contributor I

hi,

   I'm using spc5633mmlq60, the max Fsys is 60mhz,according the datasheet.

   Whe i set the Fsys 40Mhz,56Mhz,it work well.But  when i set 60Mhz,i could not work.

  Why the SPC5633mmlq60 Fsys could not be set 60Mhz?

 

 

                                               MFD + 4

        Fsys   =  Fref * ------------------------------

                                   (PREDIV + 1) * 2e(RFD)

 

     FMPLL setting:  Fsys = 60Mhz,

     (MFD=11,PREDIV=3,RFD=0,Fref=16Mhz)

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Hi, this is incorrect setting. fVCO is out of range.

 

Use MFD = 11, PREDIF = 1, RFD = 1

 

Here my colleague shared great tool for MPC55xx and MPC56xx configuration. I believe it’ll help you:

Excel MPC55xx/MPC56xx PLL Calculator 

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